Dear lbb1311,

No. Pregnancy doesn't start the day that partners have intercourse — it can take up to six days after intercourse for the sperm and egg to join and form a fertilized egg. Then, it can take six to 10 days for the fertilized egg to completely implant itself in the lining of the uterus. Pregnancy begins during implantation when the hormones needed to support pregnancy are released.

The only way to be sure of a pregnancy is to take a pregnancy test. Women can purchase home pregnancy tests at drugstores or go to health centers to take pregnancy tests. Pregnancy tests work by detecting a hormone called the human chorionic gonadotropin hormone (HCG). HCG is the hormone that supports pregnancy and starts being released when the fertilized egg implants itself and pregnancy begins.

A woman who is concerned about unintended pregnancy after unprotected vaginal intercourse may want to consider emergency contraception (EC). EC can reduce the risk of pregnancy if started within 120 hours. If started within 72 hours, EC can reduce the risk of pregnancy by 75 to 89 percent.

EC is now available to women over 18 without a prescription. Teens under 18 can still access EC the old-fashioned way — 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.

To get a prescription for EC or to arrange for a pregnancy test, call 1-800-230-PLAN to schedule an appointment at a Planned Parenthood near you, or find us online.

Hope this information helps!

Take care,

teenwire.com^® Editors

This column is for informational purposes only and is not intended to constitute medical advice, diagnosis, or treatment. If you have a medical problem, please call toll-free 1-800-230-PLAN for an appointment with the Planned Parenthood health center nearest you.