I don't know what to do!

Hey so im new to this app... So today I went over to my boyfriends house and we have sex in his room. His mom and sister-in-law we're home with us. We went to his room we started to fuck but we didnt use protection. And e told me he had nutted inside me and i got really scared because I'm not trying tp have a kid any time soon. So he noticed i was getting scared and he told me that he was just kidding. I believed him cuz he ened up nutting inside my mouth, but I feel lile he nutted inside me and then while we kepted fucking he nutted in my mouth so idk if i should believe him or not. Cuz he was like "We are having a kid baby, aren't you happy" like. Wtf!! Idk what to do? Should i believe him or not?