Hello! I had gone through your query and understand your concern. Pregnancy tests are designed to tell if your urine or blood contains a hormone called human chorionic gonadotropin (hCG). This hormone is produced right after a fertilized egg attaches to the wall of a woman s uterus. This usually happens, but not always, about six days after fertilization. If you re pregnant, levels of hCG continue to rise rapidly, doubling every two to three days. Most over the counter pregnancy tests can be used as soon as you miss a period. Most home pregnancy tests will give accurate results if you test at the time your period would normally be due, about two weeks after you ovulate. If you have a negative result, but still don’t get your period, test again three days later. If you are pregnant, the levels of hormone may build up enough by then to be picked up by the test. Hope it helped. Dr.Rovena