1. there is no such thing as "pull out" there is lots and lots of sperm in the early fluids, so he does not have to reach climax and discharge to make you pregnant. There are plenty of sperm long before that point.
2. plan B of course is not 100 percent effective.
Now of course plan B can effect your cycle so that is most likely the problem, but if you are going to be sexual active get on a birth control, make him use condoms also and study birth control so you know the facts better.
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