How many days after conception the test will show pregnancy: the types and principle of the pregnancy test, the accuracy of the test in the early stages, the results of the pregnancy test with a photo. Early pregnancy test: when can you do it, and what are the results immediately after conception?

on 23.07.2018

With a regular menstrual cycle, any delay, even for one day, makes women think about pregnancy. And, as you know, the main assistant in its identification is the test. When can he give the answer that a possible pregnancy has come? Let's understand the principle of operation of test devices and their ability to tell about the presence of pregnancy.

The main thing in the article


Types and photos of pregnancy tests

Pharmacies can offer a fairly wide range of test devices at different prices. But their main difference is not at all in price. They differ in appearance (type of construction) and sensitivity.

As for the latter, it is indicated on the packages, and it is determined based on the level of hCG in the urine:
sensitivity tests
As for the test design, they are:

  • Electronic. The most expensive reusable device. The device can indicate the presence of the fetus at the very beginning of pregnancy.
    digital
  • Midstream. They represent a device of an inkjet sample, which “receives” information after placing its tip under the stream of urine.
    Test midstream.
  • Strips.Devices in the form of a small paper strip. They are pretty cheap and are the most "running."
    strip test
  • Cassette. They are also called tablet. This is a wide cassette with a special pipette, which is collected urine and drip into a special recess.
    test cassettes

Pregnancy test: principle of action

All the above devices, regardless of appearance, have the same principle of operation. Their main function is to detect chorionic gonadotropin (abbreviated hCG) in urine. It is hCG that is responsible for the initial development of the embryo and increases, starting with the fixation of the embryo in the uterus. In some gynecological diseases, hCG can manifest itself in urine without having a pregnancy. This is caused by the malfunctioning of some organs of the small pelvis.

How to make a pregnancy test at home?

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As already noted, the basic principle of functioning of devices that check for possible pregnancy is the detection of an elevated level of hCG (pregnancy hormone) in urine. After all, she is the main reagent in the test test.

For the study, doctors recommend taking morning urine, as it has the highest concentration of the reagent needed.

Morning fence allows you to get a more truthful result.To check a possible pregnancy, you needlower the device into the urine to a special markavailable on the device.
Ifinkjet test,then its edge must be brought under a stream of urine.The need for its fence with such testing is not.
The cassette test involves the collection of urine and its subsequent use.If a cassette test is used, it is necessary to pipette a couple of drops of liquid and put it in a special groove on the cassette device. After 30–60 seconds, the reagent will have an effect and in the window of the device you can see one or two lanes.


What time to do a pregnancy test after conception?

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Doctors argue that it ismorning urine is the most "true", although manufacturers of devices do not focus customer attention on the time of testing.

If it is impossible to do research in the morning, then it can be done throughout the day, the main thing is to follow all the rules prescribed on the test packaging by the manufacturer.

Testing takes into account the fact that treatment with drugs in which chorionic gonadotropin is present can lead to a deliberately false result.Also, a false-negative test response may appear during diuretic therapy or when using a small group of drugs to lower the pressure.


What pregnancy does the test show after conception?

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Will considerthree main caseswhen the test shows two red bars:

  1. The main thing is pregnancy.A positive response appears after fixing the zygotes in the uterus.
  2. Atectopic pregnancy.This kind of interesting position is characterized by the attachment of zygotes outside the uterus with its further transformation into an embryo. This alignment leads to an increase in hCG, as seen on the test.
  3. Presentgynecological pathology.There are a number of diseases of the pelvic organs, which in the active phase can activate the process of producing hCG. At this time, the test will react as if it were a pregnancy. These pathologies can be attributed to a cyst of the ovaries, urinary tract, chorionepithelioma of the uterus.

When conception occurs: the first signs of conception

Conception is impossible withoutovulationwhich falls in the middle of the loop. How to calculate it, you can readHERE. On average, 90% of successful sexual contacts fall on the 13th – 19th day after the last menstrual periods. After the sperm reaches the egg, the birth of a little man. The ovum moves to the uterus, where it is attached to one of the walls (any). In this period of time, Mommy still does not notice the changes in her body.

The most common fatigue and irritability are attributed to PMS. The main sign of pregnancy is considered to be the absence of menstruation. Also, there are changes in the chest, there is a reaction to different smells, urge to urinate appear more often. Over time, toxicosis, aching pain in the back and lower abdomen joins the first signs.


How many days after conception will the test show pregnancy?

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The body of each woman is unique. In some, hCG begins to rise almost immediately after the zygote is attached, in others, this hormone reaches its normal (noticeable) level only 2 weeks after conception. The true answer of the test depends on the days during which the zygote moves to the uterine cavity.

On average, such a movement of a zygote spends from 7 to 10 days.Simple calculations will show that it is possible to test a possible pregnancy before the next planned menstruation in 2-3 days.

What is the probability of a pregnancy test error: early pregnancy test accuracy

The probability of getting a true answer by applying a test is 99.5%. Conducting such a study, you need to take into account the time of testing and the sensitivity of the device. For example, a device with a sensitivity of 15 mIU / ml will be able to detect pregnancy no earlier than 12 days after intimacy.

No woman can know the time of fertilization of an egg, since after intimacy with a man, spermatozoa can live in the vagina and fallopian tubes for up to 3-5 days. As for the probability to see the truthful answer on the test, by day it looks like this:
table
Up to 2% probability remains for a false positive response. To eliminate the possibility of falling into these percentages, it is better to do the research procedure for 3 days in a row.


Early pregnancy test: when can I do?

A highly sensitive test can tell about the presence of a zygote in the uterus already in the early stages. For these purposes, a highly sensitive electronic test is used that detects hCG starting at a level of 10 mIU / ml.Such a device is able to detect pregnancy, starting from 1 week from conception. It is not necessary to trust the results of tests made in the early stages without reckoning, since the percentage of incorrect answers is quite large. In order to be 100% sure that the zygotes are attached, you need to wait up to two weeks after the delay and recheck the “interesting” position using ultrasound.

Pregnancy test results: photo

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After conducting the study at home, after 30–60 seconds, the reagent stains the stripes on paper dough in red. With a positive result, two bands appear, with a negative one, only one.

There are cases when one of the stripes is of a bright color, while the other is slightly colored. With this indicator, the woman remains in doubt about the presence of pregnancy. The reason for this result may be the following facts:

  • The hormone hCG has insufficient concentration in 1 ml of urine;
  • the test is made very early and the content of the hormone reagent is minimal;
  • there is a threat of unplanned abortion;
  • substandard products (test).

With such totals, repeat testing the next morning, or test for the presence of a "pregnancy hormone" in the blood. Indeed, in plasma it appears much earlier than in other body fluids.


Will the pregnancy test show immediately after conception?

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No! So the answer will sound. After fertilization, the egg (zygote) is attached to one of the walls of the uterus in only a few days. You should also know that the egg can fertilize as much as 3-5 days after the sperm enters the vagina. After all, sperm are able to live in a female body for up to five days. Having carried out simple calculations, we find thatthe first 7–10 days after the proximity of what happened during the ovulation period, it is pointless to test;since the test device, even highly sensitive, will be negative in 95% of cases.

The menstrual cycle and its effect on test results

The accuracy of determining pregnancy through a test depends on the duration of the menstrual cycle. So, the representatives of the beautiful half of humanity:

  • with a small cycle(up to 24 days) ovulation falls for 2 weeks, which is approximately 14–16 days from the first day of menstruation.And, as already understood above, the "procession" of zygotes to the uterine cavity, where it is attached to its wall, takes up to 10 days. In other words, pregnancy with a short cycle is confirmed by a test only after the woman discovers the absence of menstruation;
  • middle cycle(24–32 days) - such is present in a larger number of women, pregnancy can be detected by a hypersensitive test immediately before the day of the expected menstruation;
  • with a big cycle(more than 32 days) an interesting position may not be detected until a clear delay in menstruation. The reason for this feature in the onset of ovulation, which is shifted in the second half of the cycle. This leads to the fact that, as in the first version (short cycle), the testing performed does not allow one to see the pregnancy in the last days of the cycle.

If the cycle is non-permanent, then it is rather difficult to identify a pregnancy after conception, since there is no guideline for menstruation. Many women with an unstable cycle who do not monitor a possible pregnancy find it at 6–12 weeks.


Why is a pregnancy test wrong?

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There is no 100% guarantee of correctness of the testing performed.There remain 2-3% of the percent at which a woman gets a false-positive or false-negative result. Why is this happening?

  • The cause of the false positive responsemay be the presence of tumors in the body of a woman. Also provoke the wrong answer can drugs with a high content of "pregnancy hormone."
  • False negative testwith an existing pregnancy, it may appear due to the minimal level of presence of the hormone, which the test device simply will not see.

An incorrect answer may appear if the pregnant woman on the eve of the study drank a lot of liquid. Excess fluid strongly dilutes urine and hCG becomes "elusive" for the test.


Video: How long will the pregnancy test show the correct result?

The most impatient women who want to become mothers can test at the end of the menstrual cycle, but the answer will be more correct if you check the pregnancy test with a clear delay. In cases where the test continues to show one lane and on the 15th day of delay, you need to go to the doctor to avoid the development of pathology, and if pregnancy is present, then confirm its normal course.

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