Here's what happened. My girlfriend and I are dry humping. We were both naked. My penis is humping the opening of her vagina but I swear I did not ejaculate and did not penetrate her. But I'm not sure if there is a presence of precm. She is suppose to have her period last May 13 but sometimes it's normal that her period is delayed for 3-5 days. I'm worried that she might get pregnant. Help.