This may sound like a childish or dumb question

I know we're all grown here but I just need to know. Does a man have pre nut more than once?

Me & my child's father had sex last night. I gave him head first. He nutted. Then he gave me head. Then we had sex but he didn't nut again because I started hurting so I made him stop. So my question is if he had came already from the head. When we had sex did you have pre nut again???? I'm asking because I don't want to be pregnant.

I know I probably sound so dumb