Sex question.


So me and my bf had sex the other day and while we were at it, he had to stop every few seconds like every 30-45 secs so he wouldn't cum in me (yea I done it without protection😩), and so he would just sit there for a min and like give it a "break". Is there any way by him holding it in, some can like "leak" out?? Idk if that makes sense buuuut plz someone help i don't wanna get pregnant. Ik I should've used protection which is what we plan on doing from now on.