It depends: Some of the side effects from Plan B can mimic pregnancy and Plan B is only 75% effective. You should still check a home pregnancy test, especially if you're late for your period. Otherwise, side effects can last up to 10 days.
Answered 9/28/2016
5.6k views
Within 72 hours: The immediate effects should be gone within 72 hours. If they persist, see your doctor.
Answered 7/14/2017
5.6k views
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