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A 21-year-old female asked:

After how many cycles does a period go tp its regular normal cycle when taking plan b?

1 doctor answer2 doctors weighed in
Dr. Timothy Raichle
Obstetrics and Gynecology 22 years experience
Yes: Planb is most effective when taken within 72 hours of unprotected intercourse. If you take planb, expect some irregular bleeding and a delay in your next cycle. Also, check a pregnancy test at least 2 weeks after unprotected intercourse.

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Last updated Dec 26, 2014

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