After a swim at like 6 PM my boyfriend and I got pretty sexual in the bathroom of our house. He rubbed his member (which had sperm residue because of his foreskin) around in the crotch area of my swimsuit bottoms when I wasn't wearing them and probably got some preejaculate in them. A couple hours later I sparcely rinsed them with some cold water, and I went swimming the next day at like 9 AM. Is there any way that this could have gotten me pregnant? He doesn't seem too worried but I am.