My boyfriend and I always have unprotected sex but this time I let him cum in me since we had bought plan b. That night we had sex three time. He came in me the first time then I took the pill, the second time he pulled out and the third time he came in me again thinking we would be fine since I took the pill. The next day he bought another plan b pill just in case but we had sex again that night before taking the pill and he came in me again, I then took the pill 10 minutes later. When we had sex it was on my ovulation day and I am now experincing cramps. What are my chances of being pregnant and should I be worried?