:confused: why do girls pee a lot after sex?

Proly because he's pushing on your bladder.. it's probably stimulating it reminding your mind that it needs to release it. What does that have to do with you being pregnant? You would not see signs moments after sex, that's a little early..

But hey I'm not expert!

The first symptom of pregnancy is a missed period. Not peeing after sex.

If you don't know the mechanisms of pregnancy and you are not ready to be a mother, please consider birth control.