So, 2 nights ago we were messing around and things got a little heated. I ended up giving him oral sex and afterwards about 5-10 mins we started rubbing our parts together. He rubbed around my vulva but There was no penetration. We did not have protection so we didn't go all the way. I was really wet from my own fluids and I'm worried that this might end up in pregnancy. My period is irregular, skips months most of the time even up to 4 months once (went to get checked everything was okay). Anyways, what are the chances of getting pregnant from just rubbing ?