No penetration. just rubbing and a towel.

Hi I'm 16. Exactly 1 week ago, my bf and I fooled around (Sorry we're just curious teenagers making foolish actions.) but it wasn't on my fertile window tho but my periods are sometimes irregular ever since I've gained weight, one time I skipped one month's worth of bloody napkins. 
So here's what happened:
He rubbed his penis on my vagina twice. On the first one, I made sure there was no pre cum on it since I heard all about pre cum can get you pregnant thing. But in the second, I didn't. Then when he ejaculated, he came on my breasts. I later proceeded to rinse it with soap and water buuuut it got a little silky so I just wiped it dry with towel instead. BUT! I stupidly used the same towel in wiping my vagina and it touched the opening for at least 3 seconds.
AM I IN THE RISK OF GETTING PREGNANT WITH THAT RUBBING AND USING THAT TOWEL?
Please help. ☹️