Me and my girlfriend had sex for about 5 mins without a condom. i didnt ejaculate, but i read that some guys have semen in their precum, not all. i was wondering if theirs any way to tell?

No assurances: If you are looking for assurance she isn't pregnant, you aren't going to get it here—though it's unlikely with just one "five minute" encounter. You might consider a more reliable type of birth control.

Anna797: Even if you did not ejacaulate, it is still possible to impregnate. Please look for signs of pregnancy and see your doctor.