Common: Pregnancy can happen on birth control pills, but uncommonly. Get a pregnancy test - if negative, keep taking the pills as directed. Sometimes it takes the body a few months to adapt to birth control pills.
Answered 3/30/2016
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Not unusual: Particularly if this is your first month on the pill, it's not uncommon for your period to be a little off. That said, a pregnancy test wouldn't be a bad idea either, just to be sure you aren't pregnant.
Answered 12/20/2012
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