Hi, I am a guy and my girlfriend and I are both 18. I would like to ask whether my precum on my penis will make my girlfriend pregnant by touching her vagina. I was wearing my underwear but she wasn't wearing anything, but my girlfriend and i noticed that my underwear wasn't wet at all. We are very worried that if my precum might have passed through my underwear and her vagina was wet at that time. We had read about it and precum do have some sperms. Will I make her pregnant even if there are spots on my underwear?? Please help..if there is a need for a urine pregnancy test, when should it be done?