Plan B can potentially throw cycle completely off. I suspect that taking it 2 months in a row can significantly increase the chances of this happening. So that is probably what's happening.
That said, if you got pregnant from the last time you had sex, it would not have shown up on a pregnancy test taken so soon, since pregnancy often doesn't occur for days after intercourse. If you are expecting your period now, and you want to be sure you aren't pregnant, wait a week and take a home pregnancy test. (or go back to your doctor). The chances that you are pregnant are actually very very low, so it's probably just Plan B messing with your cycle, but I definitely understand the need to know for sure.



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