How Long Does It Take to Get Pregnant After Having Sex?
Pregnancy doesn't start the moment that partners have intercourse. It can take up to six days for the sperm and egg to join and form a fertilized egg. Then, it takes six to 10 days for the fertilized egg to completely implant itself in the lining of the uterus. Pregnancy begins during implantation when the hormone needed to support pregnancy is released. That hormone is called the human chorionic gonadotropin hormone (HCG). Pregnancy tests work by detecting it.
A woman who is concerned about unintended pregnancy after unprotected vaginal intercourse may want to consider the morning-after pill, also known as emergency contraception (EC). EC is effective if started within 120 hours after unprotected intercourse. If started within 72 hours, EC can reduce the risk of pregnancy by 75 to 89 percent. So, the sooner it’s started, the better.
Plan B, One Step, and Next Choice are brands of EC that are available over the counter at many pharmacies for women over 17. Teens under 17 can still get EC with a prescription. The best way young women can protect themselves is to get EC before an accident happens, and keep it on hand in case they need it. That way, they won't waste time after unprotected intercourse waiting to get an appointment with a health care provider or trying to get a prescription filled.