My boyfriend and I were fooling around. We were grinding on one another. He had nothing on, and i had underwear and yoga pants on. He ejaculated on my pants in the butt area. There wasn't a lot, and I couldn't change until I got home. Which was about an hour afterwards. I was just wondering if there was anyway the sperm could have moved down to the vaginal area, through the underwear, and still managed to get inside, and gotten me pregnant. Please help.