Cold I be pregnant?

So I might just be over stressing it but I need some reassurance. My boyfriend and I had sex 3 times in a matter of a week. The first time he didn't cum (we were in an uncomfortable place and well yeah lol), the other two times he came and I saw when he did (we used protection as well). Before this he's fingered me and I always worried about him having precum on his fingers but it's never to the point were his fingers are wet and he's never had cum on his fingers while doing it. I've also been having my period regularly before we had intercourse. I know it's unlikely but I'm still kind of worried ( idk why). I've done my research and have informed myself on sex Ed. I just need   reassurance or maybe hear some opinions and views.