Can a pregnancy test detect the egg by seventh day?

A pregnancy test cannot detect an egg by the seventh day. Pregnancy tests detect the presence of human chorionic gonadotropin (hCG), a hormone produced by the developing placenta after implantation of a fertilized egg in the uterus. Implantation typically occurs 6-12 days after ovulation, and hCG levels start to rise rapidly thereafter. However, it takes several days for hCG levels to reach detectable levels in the urine or blood, usually around 10-14 days after ovulation. Therefore, a pregnancy test taken on the seventh day after intercourse is unlikely to provide an accurate result. It is recommended to wait at least 10-14 days after ovulation or the expected menstrual period for a reliable pregnancy test result.