IMPORTANT

okay , so yesterday , i was haning out with my friend who also happens to be my ex (he was also my first ever bf and my first kiss when i was like 11 or 12 and im 18 now) and we hung out at like 11 pm (this was like the day before) and we were watching tv and then things lead to another and it was like 2 am and we began flirting and then he started fingering me and eating me out , then i gave him a blowjob and we had sex (it was my first time) . i made sure before that he had protection and he did. i wanted to and i didnt mind giving my first time to him. the only thing is , he took off the condom and we did it from the back (ass) and im not sure if he came inside or not (he says he didnt) but i felt something leak down a little bit so im not sure if that was just pre cum or what. can i get pregnant from that ? thank you