Yes, it can change : Yes, Plan B can cause some irregular bleeding after use. A neg preg test taken 2 weeks after unprotected sex should be positive if you are pregnant. If you have two tests neg., that's reassuring it thru were taken 2 weeks after sex. PlanB is very effective as emergency BC, and most effective eithin the 1st 24hrs after sex. You should be just fine. Keep track of your cycles.
Answered 8/27/2015
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A doctor has provided 1 answer
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