okay so a couple of weeks ago my girlfriend and i were making out and all of that good stuff and one thing led to another and them we were laying on my bed with all of our clothes off. next thing i knew she gets on top of me and starts to grind her vagina on my penis. I dont know if there was precm because i didn't bother to look and not once did it penetrate. this was on mothers day so before she came over i showered and cleaned myself but i dont remember if i jerked off earlier that day or not and if i urinated to flush my penis out. so, could she be pregnant?