Help!

EDIT: I just started bleeding dark red blood. Is this my period? I have very bad cramps and a heavy pain feeling in my vagina, like I would get if I were on my period. Could this actually be my period?

So I had my last period July 29- August 2. Then on August 8th I had sex. We started out without a condom and then we put a condom on and he came while wearing the condom. I freaked out after that and took plan b about 10 hours later. Then we had sex again on the the 11 but the condom broke and we finished each other off other ways than sex. So I freaked out again and quickly took the plan b a second time about an hour later since I'm not on birth control at the moment since I ran out, but have an appointment to get on more. How much of a chance do I have of getting pregnant? Please help! Neither times he actually came in side of me. I know it was very stupid and it won't ever happen again.