If there is a delay in menstruation, the test will be reliable - this can be said almost for sure. However, many girls are impatient and they take the test long before the delay.
Domestic manufacturers of diagnostic devices recommend not to do this, as the result will be inaccurate. Pharmaceutical companies that produce highly sensitive tests allow diagnostics to be performed before the delay.
So, for example, the Clearblue electronic test contains instructions describing the likelihood of obtaining an accurate result:
• 4 days before delay - 55%;
• 3 days before delay - 86%;
• 2 days before delay - 97;
• a day before the delay - 98%.
If you believe the reviews of women, then before the delay, you can do the test in almost 5 days. With early implantation of the ovum, the result can be positive as early as 9 days after ovulation.
Conception does not occur at the time of sexual intercourse, but at the fusion of the egg with the sperm. The female gamete is capable of fertilization for no more than a day.
If ovulation occurred 14 days before the expected menstruation, and after 5 days the embryo was implanted in the mucous membrane of the genital organ, then at 9 DPO (the day after ovulation), a highly sensitive test will show a weakly positive result. In other words, the answer will be given five days before the delay.
However, implantation can occur (and most often it happens) on the 6-8th day of the cycle, and ovulation - 10 days before the next menstruation. In this case, it makes no sense to do a test before the expected menstruation, since even with the onset of pregnancy, it will not yet give a positive result.