A member asked:

My boyfriend came inside of me 3 nights ago & i started back taking my b.c. pill the next morning. will this help me not be pregnant?

A doctor has provided 1 answer

No: No, birth control pills will not prevent pregnancy if started after an unprotected encounter. Plan B (Emergency contraceptive pill) will. It is most effective if taken within 72 hours (3 days) of the encounter but still has effectiveness up to 5 days after. The longer the delay, the less effective it will be.

Answered 2/22/2016

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