Hi I'm an 18 year old male who is getting ready to start college. Me and my girlfriend fool around a lot but no sex whatsoever. A few weeks ago she was having her normal period symptoms like headaches, cramps, stomach aches, etc. While having the symptoms we dry humped with no penetration. I was completely naked and she had on just underwear. I did not ejaculate but there was a lot of precum and some may have got on her underwear. Even though the tip of my penis I believe never touched her vaginal opening it may have around her clitorus area on the underwear. Im very paranoid because it seems like I've been given a lot of signs about pregnancy lately. She still has not had her period and has joked a couple times about pregnancy. No test have been taken and she said her period sometimes comes at the beginning, middle or end of the month and that her cycle is all screwed up. I need help!

While very very unlikely, it is not impossible. So you as millions do each month, you now have to wait to see if she has her next period.