Dear biggest_mistake,

It seems like you've taken every precaution you can.

Emergency contraception pills (ECPs) — also known as the "morning-after pill," can reduce the risk of pregnancy if taken within 120 hours of unprotected sex. The sooner they're taken, the more effective they are — they reduce the risk of pregnancy by up to 89 percent if taken within 72 hours of unprotected intercourse.

After a woman takes emergency contraception pills (ECPs), her period may come earlier or later than usual. Also, her flow may be heavier, lighter, or more spotty. If a woman takes ECPs and does not get her period within three weeks — or if she experiences symptoms of pregnancy — she should schedule a follow-up visit with her clinician.

If you are still concerned after a week or two, you can take a pregnancy test to find out if you're pregnant. Highly sensitive pregnancy tests can detect pregnancy within seven days of ovulation.

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.