Pregnancy is always possible. The plan B, like any other form of pregnancy prevention (I won't use the term birth control, since it's an afterthought, not really a form of birth control, and not meant to be used as such) is not 100% effective.
The plan B can throw off your period, cause excess bleeding, etc.
So, could you be pregnant? Yes. Is there something else wrong? Could be. Can we tell you what's going on online? No.
If this is a concern I would suggest seeing a doctor. If this is pregnancy you can test around 2 weeks after your missed period, using first morning urine.
Good luck.
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