So, me and my girlfriend had a bit of an intimate moment the other day. Her last period was on March 9th, and on the 19th, we were messing around. She was naked, but I still had my underwear on. Somehow, my penis kind of got into her vagina, but it wasnt deep because of the underwear. I didnt ejaculate, but her vaginal fluids did make a wet spot on my underwear. Now, she's three days late on her period, and it's stressing us out. We've always been really careful about these things, so could there still be a chance she might be pregnant?