Maybe: If you have a 28-30 day cycle, then you just had sex during your fertile phase. At your age, you have about a 25% chance of conceiving. Plan b can delay ovulation, but it doesn't reverse it. So if conception already occurred before you took that pill, then it's a done deal. Unfortunately you won't know for about two weeks. Over-the-counter pregnancy tests are very accurate in two weeks.
Answered 6/30/2014
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