Usually, but...: Plan B is a hormone and can alter the menstrual period for the cycle in which Plan B was taken, and sometimes the next cycle too. One should do 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 get a "Plan A" (reliable, main birth control method) so not to need Plan B again. Plan B is for emergencies and should RARELY be needed.
Answered 10/22/2019
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