If the picture develops in such a way that the delay in menstruation is a positive test, then such conditions should not cause alarms. All test systems work on the principle of determining the gonadotropic chorionic hormone, which begins to be produced in the female body only during a developing pregnancy.
It makes no sense to conduct a study immediately after the onset of conception, because the pregnancy hormone begins to be produced only after the successful implantation of the egg into the endometrial layer, which occurs 6-10 days after meeting with the sperm.
Pregnancy tests have a certain hypersensitivity that affects the ability to detect different concentrations of hCG in the urine. When to do a pregnancy test so that the result is as reliable as possible.
Tablet and inkjet express systems have greater hypersensitivity (10 mIU / ml), therefore, they are able to detect conception as early as 3-4 days before the expected delay.
If the test system detects hCG only at its concentration of 20 mIU / l and above, then it will be able to determine that the girl became pregnant only after a delay or on her first day.
On what day of delay do tests show pregnancy at a hypersensitivity threshold of 25 mIU / ml? According to manufacturers, such express systems are able to detect hCG in urine in the first hours of the absence of menstruation, however, in practice it turns out a little differently - in order to detect conception, such a test often needs 0.5-1 week to pass after the delay. It is better to test with morning urine, in which the concentration of gonadotropic chorionic hormone reaches the maximum possible values.