My boyfriend and I were playing around and he came on my chest, but now where else. I was in my under wear and he had fingered me about ten minutes earlier. I noticed a while after that there was a wet spot on the vaginal area of my underwear. We couldn't figure out if it was his or mine and he said that it was probably mine. I'm not using birth control and we didn't use protection. We haven't had vaginal sex yet either. Can I get pregnant from his sperm on my underwear?