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unprotected sex the same night she starts back taking BC

My girlfriend takes birth control regularly. She had her period as normal and it ended Friday. It's now Sunday and we had unprotected sex, which happens to be the same night she starts back taking birth control. Is there a chance she could become pregnant?
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replied January 25th, 2016
Birth control pills need to be started within the first 6 days of the cycle, for them to provide contraceptive effect.

Since your girlfriend has started her pills properly, there is no need to be worried about pregnancy.
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