I'm so confused? What's wrong with me?!?

My boyfriend and I have just started having sex. Today was the fifth time within two weeks and it's been nothing less than great. We have had a few scares along the way. The first time, he put the tip in me to get me used to the feeling. Problem is he did it w.o a condom. We then proceeded to have protected sex after I said I was ready. Because I was so nervous about precum possibly getting me pregnant we went and got a plan b. A few days after we had sex and the condom broke. I was still in the mood so i told him to continue for a little while w.o the condom and we'd plan to get another plan b. Today I woke up with cramps and back ache and went to the bathroom to see that i was bleeding. My boyfriend came over and got my mind off things and we ended up having sex again. I had my period earlier this month and I'm confused as to what's going on with my body!?!? Am I pregnant? Another period in the same month? Idk? Help!