help?

I have been seeing this guy lately. He has asked me to go over and "sleep over" you know. We do it at least every day or so . I got my period and I stopped going over. He kinda got upset that I wasn't going over and I didn't want to tell him I was on my period. 2 days later I told him I was on my period and he told me it was alright and that I should have told him. Near the end of my period we had sex again. Mind you I was still on it. We used a condom and he came in the condom. We cuddled and then in the morning we had a quick session but he didn't use a condom. He pulled out before anything could really happen. Is there a possibility I may be pregnant? Just bc there may have been some cum on his penis ? I'm worried.