To perform a pregnancy test, it is necessary to wait a few days for the hCG levels to increase sufficiently for the test to detect them. In this way, by performing the pregnancy test at the right time, your result will be reliable.
On the other hand, if the pregnancy test is performed too early, the woman will be left with the doubt as to whether the negative result is true or a "false negative" because the hCG levels have not yet risen sufficiently.
Therefore, it is advisable to wait at least 15 days after conception or a delay in menstruation to take a pregnancy test. In addition, it will also be necessary to wait 15 days after artificial insemination (AI) or 12 days after embryo transfer to check if pregnancy has been achieved through these assisted reproduction techniques.