Not likely implanta.: Plan B can alter the menstrual bleeding for the cycle in which Plan B was taken, and sometimes the next cycle too. One should be sure to check a home pregnancy test about 3 weeks after sex, because Plan B works most of the time, but not all the time. Be sure to have a Plan A (good contraception method) in place, so that Plan B is never needed again.
Answered 8/14/2016
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3 doctors weighed in across 2 answers
A doctor has provided 1 answer
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