When Do A Pregnancy Test?

How many days of pregnancy can I do a pregnancy test? How many days after conception the pregnancy test becomes positive? Is it really necessary to wait for the delay menstruation? Can I make homemade tests prior to performing the test of Pharmacy?

We have several articles about pregnancy and pregnancy diagnosis on our site, but none of them focuses on the right time to do a pregnancy test. The questions listed above have been made with some frequency for our readers, which is why we decided to write an exclusive article about when to do a pregnancy test. In this article we will explain how many days of pregnancy are necessary for pregnancy test results become reliable.

After all, if a woman is already pregnant, why give negative tests in the early days and pregnancy?

How Long Should I Wait To Do A Pregnancy Test?

There is no single answer to that question, because it depends on the size of the woman’s menstrual cycle and the time fertilization occurred. However, as most women have a cycle with more or less 28 days, with a few more days, others a few days less, the time when the pregnancy test becomes positive does not vary much in most cases with maternity fashion including sweatshirts.

All pregnancy tests use beta hCG hormone as a way to diagnose an ongoing pregnancy. This makes sense, because this hormone starts being produced by the cells of the embryo in the first days after conception (read: UNDERSTAND your BETA HCG).

In General, it is recommended that you do the test only after your period late, because it is more or less at this time that beta hCG levels become high enough to be detected by pregnancy tests.

Why Is It Necessary To Wait For My Period Late To Do A Pregnancy Test?

The delay menstruation itself has nothing to do with Beta hCG levels. It’s just a coincidence that, in most women, just beta hCG levels become high enough to be detected around the end of the menstrual cycle, that is, at the time my period should appear. We will explain in more detail.

Ovulation usually occurs in the middle of the menstrual cycle. This means that most women ovulates more or less 14 days before the end of the cycle. As the lifetime of the egg is just 24 hours, it needs to be fertilized in this short period of time, otherwise, there is no pregnancy occurs. Later, when a woman gets pregnant, the ovum is fertilized about of 14 days before the date set for the next menstrual period down.

Once fertilized, the Zygote (the product of fertilization of the ovum by the sperm) migrates the tubes toward the uterus. This migration takes 6 to 12 days. During this time the Zygote becomes an embryo and develops the trophoblast, a group of cells that will give rise to the placenta. Is the trophoblast who produces the hormone hCG. This production, however, only begins when the embryo implants in the wall of the uterus (read: symptoms of Pregnancy in the first 12 Weeks).

So, at best, the hCG hormone starts being produced 6 days after fertilization; at worst, 12 days after fertilization. Only for this explanation I can understand why there’s no point in doing a pregnancy test a few days after an unprotected sexual intercourse. If you haven’t started the production of hCG by the embryo, there is no way any pregnancy test come back positive.

After the start of production of hCG, you need a few days for it to reach a blood concentration enough so that it can be detected by blood tests more sensitive. This means that even in the best-case scenario, which is an implantation of the embryo in the uterus around the 6th day after conception, are needed a few more 2 to 4 days to have relevant amounts of hCG in the blood. As a result, at best, the hCG just becomes detectable to 4 to 6 days prior to menstruation come down. In most cases, however, the embryo not implanted so early, and the time that it becomes detectable hCG is only 1 or 2 days before the expected date for next period. And we can’t forget that there are cases of late deployment, which causes the hCG only become positive after menstrual delay.

What Pregnancy Test Becomes Positive First?

There are only 2 types of pregnancy tests: the dosage of beta hCG in the blood and the pharmacy tests that detect the presence of hCG in the urine (read: PHARMACY PREGNANCY TEST). The most reliable test is definitely the blood hCG dosage. This review is so reliable that anymore even though you have a pharmacy test positive, is shown doing a blood test to confirm the result.

Blood tests can detect hCG beta with concentrations up to 20 smaller than urine tests. In addition, for beta hCG shows up in the urine, it takes before the hCG in the blood is in relevant concentrations. Therefore, the blood test becomes positive a few days before the urine test, and may be positive even before menstrual delay.

However, as the test of pharmacy is much more simple to be done, provides a result in an almost instant, does not require needle stings and is able to detect beta hCH just a few days after the blood test, he ends up being the simplest option for anyone who wants to know if you’re pregnant or not.

If you want to know how to make a pregnancy test in specific brands, as the Clearblue tests confirm, Gravtest Easy, Materntest test strip, Baby Sure and others, read: HOW to MAKE PREGNANCY TESTS of PHARMACY.

When The Pregnancy Test Result Is Really Reliable?

The causes of false positive pregnancy test, that is, a positive test in a woman who is not pregnant, are rare. Therefore, in principle, if a pregnancy test, urine or blood, it’s positive, we should believe that the woman is actually pregnant.

On the other hand, a false negative pregnancy test, i.e. a test come back negative in a pregnant woman, is relatively common, especially if the test is being done before menstrual delay. In these cases, the test gives negative is because the woman is not pregnant, but because the hCG level produced by the embryo is still so low, that the tests can’t detect it. False negatives are more common in urine tests than in blood tests.

Pregnancy tests usually positive blood between the 8th and the 13th day after the design (i.e., 1 to 6 days before the menstrual delay). From the first day of menstrual delay, the chance of blood pregnancy test come back positive is 99%. If your period is delayed a day and the blood test was negative, the chance of you being pregnant is very low. If by chance you are having symptoms of pregnancy and not to convince yourself you’re not pregnant, the test may be repeated after 5 days (read: 20 FIRST SYMPTOMS of PREGNANCY). Sometimes, the woman misses the calculation of your cycle and just thinking my period is late when it is not. This is common in women with irregular cycles. In these cases, the blood test can give false negative.

Already the pharmacy pregnancy test is not so simple to be interpreted. There are dozens of different brands, some of which are more sensitive than others to detect beta hCG. Some brands can detect hCG beta with 1 day menstrual delay in 97% of pregnant women, but there are others whose sensitivity is just 54%, i.e. 46% of pregnant women will have a false negative. Therefore, for a pharmacy pregnancy test is really reliable, the ideal is to do it with only 5 days late. The test of pharmacy may even be done after 1 day late, but if he comes back negative, you have to repeat it after 1 week, because the chance of a false negative is low.

The home pregnancy test can be done before the pharmacy or blood tests?

As we explain in detail in the article: home pregnancy test – Myth or truth?, pregnancy tests made at home, be with bleach, Coca-Cola, vinegar, toothpaste or any other homemade product, are not reliable and are not intended to diagnose or rule out a pregnancy. These tests have no scientific basis and can still do harm, because the urine reaction with chlorine or bleach can release toxic gases.

So, if you think you may be pregnant, do home pregnancy test. The correct behaviour is to go to the drugstore to buy a real pregnancy test.

Common questions about the right moment to do the pregnancy test

If I’m using any contraceptive method, the time to do a pregnancy test can be changed?

No, no contraceptive method interferes with the result of beta hCG.

Any medicine can prevent a pregnancy test to be positive?

No, no medication interferes with the result of beta hCG to make it negative in pregnant women.

Negative Pregnancy Test After 1 Week Of Delay’s Final Menstrual?

Yes, unless you have the wrong date of the arrival of menstruation. If you think the menstruation is delayed 7 days, but she really is only 1 or 2 days late, there may be a false negative.

If I Don’t Know The Date Of The Next Menstruation, When Should I Do A Pregnancy Test?

If the woman has a very irregular cycle or is not following the dates of your period to find out when the next period should get, a pregnancy test should be made at least 21 days after sexual intercourse which could generate a pregnancy. If the woman had multiple relationships in this period, the interval should be counted from the last relationship unprotected. Obviously, if my period come down before the 21st day, no need to take the exam, as this indicates that the woman is not pregnant.

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