Plan B is most effective when taken as soon as possible after unprotected intercourse. However, studies show that it can be effective even when taken as long as 120 hours (5 days) after unprotected intercourse.
After taking Plan B, your next menstrual period should begin within 2-3 weeks. It’s normal for your next period to be a few days late or early. It may be heavier, lighter, or spottier than usual. If your period has not started within 3 weeks, do a pregnancy test.
14. February 2012
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