My girlfriend and I had dry humped I must confess. I am going to be more careful and responsible perhaps avoid it but to my question, so my girlfriend was in some thin gym shorts and had undergarments underneath. I had basketball shorts but no undergarments. After dry humping, she orgasmed, I did not ejaculate, however I did have miniscule pre semen stains on my shorts. She removed her undergarments afterwards, her shorts felt dry and I was wondering, is there a possible chance that the pre semen could get her pregnant because of these actions of rubbing clothed gentalia?