Condom got stuck

So me and my partner had sex this Saturday and we used a condom . We did two postions one was missionary the other one I was on top . When I got on top of him the condom came off and it was stuck in me. When I looked inside I didn’t see any ejaculation in it and the condom wasn’t broken so he fixed it on again and after that I gave oral and he ejaculated in my mouth. I’m just wanna make sure that I’m not gonna get pregnant because before I did have sex my period didn’t come yet and still isn’t here yet . He didn’t ejaculate inside of me .