A member asked:

I had unprotected sex i knew my period would start the next day and it did. i took the plan b pill on the same day will it effect my cycles length?

5 doctors weighed in across 3 answers
Dr. Irving Harper answered

Specializes in Internal Medicine

Could: Plan b does have hormones in it so it could alter your cycle , but only temporarily

Answered 11/15/2014

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Happens sometimes: Your cycle length may be slightly altered but will most likely go back to normal within the next 1-2 cycles, if not then consult your PCP or GYN.

Answered 11/30/2014

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May: not since your period is starting the next day. Though plan B can cause bleeding and spotting

Answered 11/15/2014

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