Hi, I am a 20 year old boy. My girlfriend, who is 17, and I were fooling around 2 days ago. She had her panties on, and I was exciting her by pressing my penis against her vagina. There was no insertion since her panties were on. It got a little intense and I ejaculated after a while onto her panties. She removed and changed her panties within 30 seconds of my ejaculation. Do we run the risk of a possible pregnancy? Can sperms travel through clothing that fast? Also I am worried about pre-ejaculate. I read on the internet that it contains sperms, if the boy has not urinated after his last ejaculation. But I am sure that I have urinated at least 3-4 times, since the last time I ejaculated, which was when I was masturbating, 2 days before this incident. Please help me and tell me if we run the risk of a possible pregnancy.