bleeding during sex

hey guys,

me and my boyfriend had sex yesterday night. and we have had sex before. but yesterday we tried a new position. I was laying on the bed and he was on top of me holding my legs down. and we had protected sex. and he got a couple of strokes in and then it sounded like a pop, like the condom had broke. (it has happened to us and it has sounded like that before) so he pulled out of me and the condom wasn’t broke, but there was blood. what could that son be from?

p.s. we checked the condom and there were no holes in it at all. any chance if the condom was broke that I could get pregnant from pre cum. I don’t ovulate until tmr.