Dear drivestrong,

After a woman takes emergency contraception (EC), her period may come earlier or later than usual. Also, her flow may be heavier, lighter, or more spotty. If a woman takes EC 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.

EC can reduce the risk of pregnancy when taken within 120 hours of unprotected sex. The sooner they're taken, the better. If started within 72 hours of unprotected sex, they can reduce the risk of pregnancy by 75 to 89 percent.

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.