Do guys know when a woman is about to bust?

Al

I recently had sex and I never have had an orgasm before. So during our sex (missionary at the time), I felt this urge to pee and I was not too sure if this was an orgasm coming on...? I did tell him to stop so I could pee, but he kept telling me to bust on his penis, so idk if he felt that I was about to orgasm or if I just had to pee, which I did go and do.