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A 21-year-old female asked:

Hello i was supposed to start my period today but i didn't. i took a plan b pill 2 weeks ago and had unprotected sex three days before my period. my b?

1 doctor answer1 doctor weighed in
Dr. Robert Kwok
Pediatrics 33 years experience
About Plan B...: Plan B can alter the menstrual-type 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.

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Last updated Apr 13, 2017

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