Can a pregnancy test result be positive BEFORE the first missed period, but after fertilization and conception?
Yes. Many pregnancy tests detect a levels of a hormone called human chorionic gonadotropin (HCG) in the urine. Fertilization occurs when the sperm and egg fuse to form a zygote. Shortly after this, the placenta will start developing and HCG will start to be secreted. HCG levels rise in the mother’s blood and in the urine, with significant levels observed as early as 3-4 days after implantation of the zygote in the uterus. Therefore, HCG may be detected before the first missed period and result in a positive test. There may be some limitations to a pregnancy test, however, such as urine being too dilute to contain representative levels of HCG. So if you suspect that you may be pregnant, it is important to consult a physician.