i am worried my girlfriend may be pregnant. her period was due 3 days ago and although we have never had sex i think there may be a chance. the only time i think it could of happened was when we were rubbing up against eachother. she had no clothes on and i had my boxers on. i did not ejaculate but there was precum. could this have sperm in it? and if so could it go through my boxers and inside of her?