Pregnancy will show 4 days before menstruation. Pregnancy test when to do

Pregnancy test when to do? It seems that this science is not too difficult - to use the subject of self-diagnosis of an interesting situation, but sometimes girls make annoying mistakes when conducting tests, which is why the result is incorrect. Let's look at the basic rules that need to be followed when diagnosing pregnancy, and the main mistakes that lead to distorted results.

When to take a pregnancy test? If we are talking about the date, then it is best to wait for the first day of the missed period. It is this recommendation that is found on absolutely all packages of pregnancy tests. But many women do not want to wait so long after the probable conception and begin testing as early as 10 days after ovulation, that is, before the start of the delay in menstruation. And, accordingly, most of them receive either incorrect or dubious results. The second stripe, meaning the presence of hCG ("pregnancy hormone") in a woman's urine, may not appear or appear barely noticeable, so that it will be impossible to interpret the result. Therefore, advice to those women who do not have the patience to wait for the right time for diagnosis: take a blood test for hCG. Here he just shows a reliable result within 10 days after a possible conception. The doctor is unlikely to give you a free referral, unless you are registered for infertility, but you can take this test for a fee. Always keep a pregnancy test in mind when it shows the correct result and do not worry ahead of time.

What time of day is it better to do the test? It is recommended in the morning, after waking up, in order for the concentration of human chorionic gonadotropin to be maximum, sufficient for the second strip to appear in case of a positive result. This is with regard to the early dates. And in the second half of the first trimester and later, a pregnancy test, when it is better to do it: morning, afternoon or evening, does not matter. Ask: why do the test for such a long time, when the doctor, during a gynecological examination, will be able to make the correct diagnosis, and the fetus is already visible on the ultrasound scan? And the fact is that in such a simple way, women are trying to identify a possible threat of miscarriage or a frozen pregnancy, which is fundamentally wrong. If during a long period of pregnancy the test suddenly became negative, it only means that it is not of high quality.

How many days after the delay the test will show pregnancy (video):

In conclusion, we will list the reasons why the tests show incorrect results.

1. Too early diagnosis (before the onset of missed periods).

2. Performing the test outside the morning hours as recommended.

3. Poor quality test strip (it may have been stored in case of temperature violations or expired).

4. Evaluation of the result earlier or later than the time specified in the instructions.

5. The woman has a disease that results in an increase in the level of hCG.

This happens with some cancers, for example.

An approximate algorithm of actions for those who doubt the result.

1. Buy and make a couple of tests with higher sensitivity from other manufacturers.

2. Measure basal temperature in the morning without getting up from sweating. If it is above 37 degrees, most likely there is a pregnancy.

3. Pass a blood test for hCG. In this case, the reliability of the result is not even discussed.

4. Go to an appointment with a gynecologist. The doctor will be able to determine the gestational age (if any) if the delay lasts more than 2-3 weeks.

5. Make an ultrasound. Thus, you can quite accurately not only diagnose the presence of the ovum, but also find out its location. If all the signs of an interesting position are present, and the ultrasound does not show the embryo in the uterus, with all that, the delay has already begun, then there is a high probability that the embryo began to develop outside the uterus, and this is very dangerous.

Pregnancy tests are certainly convenient and affordable. Every woman who is sexually active should learn how to use them and know the peculiarities of diagnosing pregnancy.

When planning a pregnancy, a woman looks forward to the confirmation of her hopes.

If earlier it was possible to find out about a joyful event by the absence of menstruation, modern technologies make an express method available - an accurate determination of conception using a test.

Some test models are so sophisticated that they can detect pregnancy a few days before the delay.

From the moment of conception, a special hormone begins to enter the woman's bloodstream - chorionic gonadotropin, produced by chorion. A day later, hCG appears in the woman's urine. At the same time, the rate at which the indicator of the level of matter grows is amazing. During every 2 days, the volume of the hormone doubles.

If the menstrual cycle lasts longer, 30-36 days, then any pregnancy test can show a positive result a little earlier than the delay, about a week before the date of the expected period.

However, this does not always happen. In women with a longer menstrual cycle, the first part is most often increased, when the endometrium is preparing for the introduction of the egg.

The second half of the cycle usually lasts no more than the standard 12-14 days. For example, if a woman has a menstrual cycle of 35 days, the first phase is 21 days, and the second is 14 days. Consequently, during fertilization, the concentration of the hormone required for accurate testing will be achieved only in the first days of delayed menstruation.

However, detection of pregnancy before delay is possible if ultrasensitive systems are used.

Tests that detect pregnancy before delay include all tests with a sensitivity of 10-15 mIU / ml.

With their help, you can get a reliable result already 10-11 days after fertilization, since by this time in the urine it will be 8-16 mIU / ml, but only if the embryo implantation occurred no later than the 7th day after the moment of conception.

The introduction of the embryo into the uterine lining does not necessarily occur on the 7th day, it can take place after 8 or 10 days. In this case, the hypersensitive tests will be negative and will not be able to ensure the validity of the result until the delay.

However, egg implantation may occur earlier and in this case the test will show a positive result a week before the delay. It all depends on the individual characteristics of the menstrual cycle, the anatomical structure of the female reproductive system.

Having decided to use the test before the delay, it is better to pay attention to the products of reliable manufacturers who have been holding leading positions in this area for a long time. These include tests:

• Frautest express with a sensitivity of 15 mMe / ml;
• Test strips "Evitest"
• Mom Test is ultrasensitive;
• Premium diagnostics;
• BB test;
• Test for Вest.

However, the manufacturers themselves admit that the reliability of such tests does not exceed 55% if the urine analysis was carried out before the first day of the delay. That is why it is recommended not to trust too much the results of tests carried out before the expected time of the onset of menstruation and be sure to repeat the test after a few days.

Personal experience

My first pregnancy, like all subsequent ones, was planned. Therefore, a few days after conception, I began to listen to my body. Of the early signs of pregnancy, only a terrible pain in the mammary glands was noted. The rest was as usual. It was this fact that made me take a pregnancy test. I really wanted to know as soon as possible the result of our efforts with my husband. And so a week before the day of the expected period, I did a test.

I bought an ordinary cheap test with a sensitivity of 25 mIU / ml. He showed a faint second stripe. A day later, I repeated the test - the second strip became brighter. After another 2 days, I did 3 test - the second strip in color intensity was equal to the first. There really was a pregnancy. A week later, this was confirmed by ultrasound.

The second time (when planning a second child), I decided to wait for a delay, since I could not get pregnant within 6 months. And every month I spent a bunch of tests, but the result was still not. So, in the month when I did not think that I became pregnant (there were no sensations at all indicating a possible conception), my periods did not come. The test was already done after the delay and it showed a bright second strip.

3 times I again decided to test before the delay. I made 2 tests with a difference of 1 day. Both tests were negative. However, her period never started. On the first day of the delay, I conducted 1 more test - it showed a weak second strip. I was even scared, and suddenly ectopic. But a week later, an ultrasound scan found a fetal egg in the uterus. Everything was in order and the pregnancy was progressing!

Why in one case the test showed pregnancy before the delay, and in the other not - for me it remained a mystery. But I think that it still depends on the date of conception, on the length of the cycle (during the first pregnancy, the cycle length was 33 days, then the cycle became shorter), and on how quickly the embryo is fixed in the uterus. After all, the ovum, which has safely reached the uterus, can be in limbo for up to 2 days.

The conclusion is this: you can do tests even before the delay, and it is even very likely that a weak second strip will appear. But still, it is better to do a control test from the first day of a missed period.

There are many reasons why a woman wants to find out about pregnancy as soon as possible or make sure that it is not. In some cases, she plans to become pregnant in the near future. In others, she wants to make sure that the contraceptives she uses are working well. Thirdly, a woman is treated with drugs or methods, the use of which during pregnancy is highly undesirable. Fourth ... The list goes on.

Regardless of the reason, women are looking for an accurate and effective way to detect pregnancy as early as possible. Is there a test that detects pregnancy before the date of the expected period, and how reliable is the result?

Principle of operation and types of pregnancy tests

After conception, changes begin in the body of the expectant mother. One of the first changes is the appearance in the female body of the hormone of pregnant women - chorionic gonadotropin.

This hormone is produced by the placenta from about the second week of pregnancy. Every day its number doubles compared to the previous one, that is, the concentration grows exponentially. It first appears in the blood, from which it enters the urine of a pregnant woman. This feature is used to confirm the presence of early pregnancy. What is the principle of the rapid pregnancy tests?

A pregnancy test is in the form of a strip or device with a urine bag and a window for the conclusion of the result. Regardless of the design, it contains an indicator, which is a specific dye-labeled antibody that recognizes human chorionic gonadotropin (hCG). Usually, there are two lines on a test strip: a control line (colored regardless of the presence of pregnancy and shows that the test is suitable for use) and an indicator strip (contains antibodies with a dye that changes color only upon contact with hCG).

In addition to the usual, there are special high-precision test options that contain fluorescent or radioactive molecules instead of a dye. These tests are not sold in pharmacies, but are only used in specialized laboratories.

The commercially available tests can be divided into:

• standard (respond to the concentration of chorionic gonadotropin over 25 mIU / ml);
• hypersensitivity (sensitive to the content of hCG at a concentration of 10-15 mIU / ml).

Depending on the design and display option of the result, tests are divided into:

• test strips, or strips (a paper strip on a plastic backing with an indicator is lowered into a container with collected urine);
• jet (there is no need to collect urine in a dish, it is substituted under the stream);
• digital (urine is dripped into the urine bag, the result is displayed in a special window).

Variants of various tests are shown in the photo. They are all sold in pharmacies, where you can buy them without a prescription.

On what day from conception can the test react to hCG?

Can a home test be positive if done before your period is late? In what segment of the cycle is it worth and makes sense to conduct such testing? In order to answer this question, let us consider the processes taking place in the female body in dynamics.

The fusion of the egg with the sperm occurs in the fallopian tube. Within 3-5 days, the ovum moves along the tube and enters the uterus. Here it is implanted into the lining of the uterus.

Chorionic gonadotropin appears in the body 24–48 hours after implantation, but in the first days its concentration is negligible and cannot be recognized during testing. However, the production of the hormone increases rather quickly and has the following dynamics:

• 1 day after implantation - 4 mIU / ml;
• Day 2 - 7 mIU / ml;
• 3 day - 11 mIU / ml;
• Day 4 - 18 mIU / ml;
• 5 day - 28 mMU / ml;
• 6 day - 45 mIU / ml;
• 7 day - 73 mIU / ml;
• 8 day - 105 mIU / ml;
• Day 9 - 160 mIU / ml.

Here are the average values ​​of the hCG level. In different women, deviations of indicators from the average in one direction or another may be observed, depending on the characteristics of the organism as a whole and its endocrine system in particular. Therefore, a pregnancy test before a delay may show different results.

Features of the menstrual cycle and the dependence of the time of conception on its duration

One of the main individual characteristics that affect the test results when applied before the delay is the duration of the menstrual cycle in a particular woman. Cyclic changes can normally last from 21 to 35 days.

When calculating, one must remember that the contact of the sperm with the egg released from the ovary does not always coincide with the date of sexual intercourse, fertilization can occur 1-2 days later. This means that the time of conception may shift by this time period, which will affect the hCG level and the result of the pregnancy test.

Normal 28-day cycle

Most standard pregnancy tests recognize an hCG concentration of 25 mIU / ml and above. Under favorable conditions, this concentration is reached on the day that coincides with the expected date of the next menstruation. Therefore, the likelihood of a negative result with such testing is high. For early diagnosis of pregnancy, highly sensitive tests that respond to a hCG concentration of 10-15 mIU / ml are more suitable. With their help, you can determine the presence of pregnancy before the expected date of the next period.

Short cycle

Some women have a shortened cycle that lasts 21 days. The shortening can occur due to the first, second or both phases. With a 21-day period, ovulation occurs on days 8-10. The concentration of hCG, which can be used to detect pregnancy using tests, in such women is reached by the time the menstrual cycle has come to an end, or even later. For these reasons, the diagnosis of pregnancy before the onset of menstruation is difficult.

In this case, tests with normal sensitivity are not suitable, you need to choose the most highly sensitive varieties. Before menstruation is delayed, it is recommended to use digital tests "Evitest", "Frautest" or "Clearblue", which are sensitive to lower concentrations of hCG and are more likely to indicate pregnancy. The domestic version of such tests Clever has the same accuracy, but is much cheaper.

Long cycle

The extended cycle of 35 days has its own characteristics. Usually, the first part of the period, before ovulation, is increased, and the second lasts the same as in women with a cycle of 28 days. If you need to test without waiting for menstruation, it is also preferable to use tests that are sensitive to low concentrations of hCG, since the usual ones can give a negative result.

Is it possible to determine pregnancy with a test before the delay?

Most women have the opportunity to find out about their pregnancy before missed periods. In each cycle there is a time interval suitable for fertilization of the egg, which lasts several days. It is called the fertile window. If conception occurred at the beginning of this period, then there is a high probability that the woman will be able to find out about her pregnancy even before the delay.

The accuracy of the indicators directly depends on the following factors:

• the degree of sensitivity of the test;
• the duration of the cycle for a given woman;
• the number of days remaining before the estimated date of menstruation;
• the time of day at which urine was collected for analysis.

When will the test show an absolutely reliable result?

Could a test done before the delay be wrong? The percentage of confidence is a variable value that changes as the onset of menstruation approaches. In women with a standard 28-day cycle, this relationship looks like this:

• a week before the delay, the accuracy of the analysis will be 25%;
• for 5 days - 33%;
• for 4 days - 42%;
• for 3 days - 68%;
• for 2 days - 81%;
• per day - 93%;
• on the day of delay - 96%;
• after a delay - 99.9%.

In addition to the usual statistical errors, tests can show a positive result in the absence of pregnancy, or vice versa, negative if there is one.

Why is a test error possible and what are the factors influencing its occurrence? Reasons for a false negative result:

• low concentration urine (with copious drinking);
• spoiled test;
• premature testing (more than a week before the expected start of menstruation);
• ectopic or frozen pregnancy;
• death of the embryo in the early stages.

The test can give a false positive result:

• after the introduction of drugs containing chorionic gonadotropin;
• with a recent miscarriage or abortion, when part of the ovum remains in the uterus;
• with some tumor diseases.

How and when should a test be done to improve its validity? Experienced doctors give several recommendations on this matter:

• the analysis will show a more accurate result if you do it immediately after waking up in the morning, since the urine collected in the morning contains the maximum amount of chorionic gonadotropin (if it is produced);
• analyze only freshly collected urine and use clean dishes;
• choose rapid tests with high sensitivity to the hormone;
• carefully follow the instructions for use of the test;
• if there are obvious symptoms of pregnancy, and the analysis is negative, it is worth repeating it after 1-2 days, when the concentration of hCG becomes higher.

It was the third month of our first-born planning with my husband. Last month I did a test, and it was negative, then THEY came, cd .. In this month after ovulation, my stomach suddenly began to pull, it constantly whined, like on cd, but it only started 4 days after ovulation, when before menstruation was still a week and a half. Then I began to run to the toilet in a small way every half hour or hour, all day I kept the temperature from 37 to 37.3. Well, of course, suspecting an infection or some kind of inflammation, I called my doctor, who, as luck would have it, was on vacation. She advised in absentia to break through the antibiotic, but-shpu, papaverine, to do an ultrasound scan and a pregnancy test. The first Ultra test (8 days after ovulation) showed 1 band (the ultrasound also did not notice anything unusual (how else, almost a week before menstruation?), I had been taking the antibiotic for 3 days already, that is, the temperature and running to the toilet should have stopped if it were an infection. I decided to take a blood test for hCG. When the result came, and I saw there "17.5", which, according to the deciphering of the results by the laboratory, meant 2-3 weeks of pregnancy, I was shocked, not I could believe. After that, I ran to the pharmacy and bought Evitest. I made it at home (9 days after ovulation, 5 days before menstruation) and at first it seemed to me that there was only one strip

But after 2-3 minutes I saw a bland second strip. Do you see it too?)

Struck by the fact that the "highly sensitive test" with a sensitivity of 10 IU / ml, promising a "true result from the 7th day of conception" showed nothing, and Evitest with a sensitivity of 20 IU / ml, "from 1 day of delay" - showed in 5 days before menstruation, when there was only 17.5 IU / ml in the blood. (and in urine, as you know, this indicator grows more slowly than in blood).

Yes, of course, I know that before the delay, such tests and even a blood test for hCG are not informative, and doctors do not take them into account.

Of course, I know that the result of hCG up to 25 is doubtful and must be double-checked.

Of course, I'm still afraid to believe in a miracle.

But I really want to believe ... I read many stories where girls, as a result of such stories, had a long-awaited lyalya

Of course I will also hand over hCG in dynamics, the day after tomorrow, on the first day when menstruation should (not) begin and everything will clear up.

Wish me good luck

If earlier it was possible to find out about a joyful event by the absence of menstruation, modern technologies make an express method available - an accurate determination of conception using a test.

Some test models are so sophisticated that they can detect pregnancy a few days before the delay.

What is the effectiveness of pre-delay pregnancy tests based on?

From the moment of conception, a special hormone begins to enter the woman's bloodstream - chorionic gonadotropin, produced by chorion. A day later, hCG appears in the woman's urine. At the same time, the rate at which the indicator of the level of matter grows is amazing. During every 2 days, the volume of the hormone doubles.

Pregnancy tests are sensitive to the presence of the hormone. By the way, in the body of any person there is a small amount of α-hCG. But after conception, the chorion begins to produce a completely new type of protein - β-hCG.

Therefore, in most cases, if a pregnancy test shows a positive result, congratulations can be accepted.

Currently, there are several types of tests. However, they are all based on sensitivity to hCG. By design, they are distinguished:

• test strips;
• inkjet tests;
• digital.

Test strips are the most popular way to determine pregnancy, since the products are inexpensive and can be purchased at any pharmacy kiosk.

The disadvantages of strips include the need to collect urine in a clean, dry container.

Jetting systems are considered the most convenient method because the test can be used without collecting urine. This makes the test as simple and comfortable as possible.

Digital tests are a modern option that allows you to see the result in a special electronic window.

One of the electronic tests, ClearBlue, is even able to show the gestational age. The disadvantage of the system is its high cost.

Regardless of the type of device, they all have the same capabilities. The strip and digital test give an accurate result about 97-99% of the time, if used from the first day of the delay.

The diagnostic accuracy 4 days before the delay is no more than 50%, 2 days before the delay, the indicator rises to 80%.

In addition, any test can give a false positive or false negative result. What is the reason for the probability of error?

Each test is equipped with a reagent that reacts with the hCG hormone. In the presence of a sufficient concentration of chorionic gonadotropin, the result is positive, in its absence - negative.

A false positive result is less common, since β-hCG is produced by the female body only with the onset of pregnancy.

However, a similar effect is possible if:

• the test is carried out several weeks after childbirth;
• shortly before the test, the woman had an abortion or a miscarriage;
• there is an oncological disease in which an analogue of chorionic gonadotropin is produced;
• the woman underwent a course of administration of drugs containing hCG.

False negative results are much more common. Its causes are:

• improper test performance;
• kidney or cardiovascular disease;
• the threat of spontaneous abortion;
• frozen or ectopic pregnancy;
• poor quality test.

However, the most common cause of error is rush. Many women claim that they feel changes in the body already 1-2 days after conception, and therefore they are in a hurry to make sure that pregnancy is occurring.

Will the test show pregnancy before the delay in menstruation?

In most cases, the tests have a sensitivity of 25 mIU / ml. Such a concentration of the hormone in the blood serum is achieved only by 12-14 days after conception.

In women with an average menstrual cycle, this time coincides with the onset of menstruation. Therefore, most manufacturers recommend that a pregnancy test be performed from the first day of the delay.

All tests with a sensitivity of 25 mIU / ml are capable of showing pregnancy 1-2 before the delay.

In this case, a positive result appears as a weak second streak.

If the menstrual cycle lasts longer, 30-36 days, then any pregnancy test can show a positive result a little earlier than the delay, about a week before the date of the expected period.

However, this does not always happen. In women with a longer menstrual cycle, the first part is most often increased, when the endometrium is preparing for the introduction of the egg.

The second half of the cycle usually lasts no more than the standard 12-14 days. For example, if a woman has a menstrual cycle of 35 days, the first phase is 21 days, and the second is 14 days. Consequently, during fertilization, the concentration of the hormone required for accurate testing will be achieved only in the first days of delayed menstruation.

However, detection of pregnancy before delay is possible if ultrasensitive systems are used.

Tests that detect pregnancy before delay include all tests with a sensitivity of 10-15 mIU / ml.

With their help, you can get a reliable result already 10-11 days after fertilization, since by this time the concentration of hCG in the urine will be 8-16 mIU / ml, but only if the embryo implantation occurred no later than the 7th day after the moment conception.

The introduction of the embryo into the uterine lining does not necessarily occur on the 7th day, it can take place after 8 or 10 days. In this case, the hypersensitive tests will be negative and will not be able to ensure the validity of the result until the delay.

However, egg implantation may occur earlier and in this case the test will show a positive result a week before the delay. It all depends on the individual characteristics of the menstrual cycle, the anatomical structure of the female reproductive system.

Having decided to use the test before the delay, it is better to pay attention to the products of reliable manufacturers who have been holding leading positions in this area for a long time. These include tests:

• Frautest express with a sensitivity of 15 mMe / ml;
• Test strips "Evitest"
• Mom Test is ultrasensitive;
• Premium diagnostics;
• BB test;
• Test for Вest.

However, the manufacturers themselves admit that the reliability of such tests does not exceed 55% if the urine analysis was carried out before the first day of the delay. That is why it is recommended not to trust too much the results of tests carried out before the expected time of the onset of menstruation and be sure to repeat the test after a few days.

Personal experience

My first pregnancy, like all subsequent ones, was planned. Therefore, a few days after conception, I began to listen to my body. Of the early signs of pregnancy, only a terrible pain in the mammary glands was noted. The rest was as usual. It was this fact that made me take a pregnancy test. I really wanted to know as soon as possible the result of our efforts with my husband. And so a week before the day of the expected period, I did a test.

I bought an ordinary cheap test with a sensitivity of 25 mIU / ml. He showed a faint second stripe. A day later, I repeated the test - the second strip became brighter. After another 2 days, I did 3 test - the second strip in color intensity was equal to the first. There really was a pregnancy. A week later, this was confirmed by ultrasound.

The second time (when planning a second child), I decided to wait for a delay, since I could not get pregnant within 6 months. And every month I spent a bunch of tests, but the result was still not. So, in the month when I did not think that I became pregnant (there were no sensations at all indicating a possible conception), my periods did not come. The test was already done after the delay and it showed a bright second strip.

3 times I again decided to test before the delay. I made 2 tests with a difference of 1 day. Both tests were negative. However, her period never started. On the first day of the delay, I conducted 1 more test - it showed a weak second strip. I was even scared, and suddenly ectopic. But a week later, an ultrasound scan found a fetal egg in the uterus. Everything was in order and the pregnancy was progressing!

Why in one case the test showed pregnancy before the delay, and in the other not - for me it remained a mystery. But I think that it still depends on the date of conception, on the length of the cycle (during the first pregnancy, the cycle length was 33 days, then the cycle became shorter), and on how quickly the embryo is fixed in the uterus. After all, the ovum, which has safely reached the uterus, can be in limbo for up to 2 days.

The conclusion is this: you can do tests even before the delay, and it is even very likely that a weak second strip will appear. But still, it is better to do a control test from the first day of a missed period.

Xenia, 33.

Women who dream of becoming mothers are looking forward to seeing the striped test. The painful expectation of a "late" period seems eternal, so they use a pregnancy test even before the delay. After all, manufacturers of highly sensitive devices assure that it is quite possible to "detect" the long-awaited conception at such an early date. How true these statements are and why expensive and reliable tests are still wrong, we will tell in our article.

How the pregnancy test works

Aids for diagnosing pregnancy have become so widespread and popular that manufacturers are constantly improving them, making them more convenient, practical and more sensitive. The last criterion, according to them, is the most important, since it is thanks to it that conception can be detected at the earliest possible date.

Thanks to a variety of forms, a woman can make a pregnancy test wherever she wants, and when she pleases. Nevertheless, regardless of the price and type of devices, all tests that determine pregnancy work according to the same method: they secrete human chorionic gonadotropin among other hormones in a woman's urine. It would be more correct to say its quantity. After all, this hormone is always in the body of men and women, but in an extremely insignificant concentration.

At the moment when the process of implantation into the wall of the uterus of the future embryo takes place, a rapid increase in hCG begins. Every day after conception, the amount of the hormone doubles. It is produced by the shell that covers the ovum, which in a few weeks will become the placenta of the fetus.

The first day after conception, the "sign" hormone can be detected only in the blood. In other biological fluids, its amount is minimal. However, the closer the time of the menstrual cycle comes, the more the hormone will accumulate in the urine. When its amount reaches 10 IU, especially sensitive specimens will be able to "calculate" pregnancy. The table below reflects the amount of hCG in the blood. The level of hCG in urine is slightly behind.

What day to take a pregnancy test

It would seem that everything is very clear, and sensitive tests will determine the presence of pregnancy already on the seventh day after fertilization. However, in practice, everything is not so simple. The fact is that the time to reach the desired level of hCG concentration in urine will be different for all women. It depends on the following factors:

• The duration of the menstrual cycle;
• Day of ovulation;
• The day when fertilization occurred;
• Physiological characteristics of a woman.

Moreover, you need to know that a positive result of a highly sensitive test may be due to a biochemical pregnancy. In this case, the positive result of the diagnostic device does not deceive the woman: conception did indeed take place. However, for some reason, the pregnancy stopped developing, which was reflected in the onset of menstruation.