I need help. TMI

So today I lost my virginity. Kinda. I was taken advantage of last year and doesn't count that. So anyways, today me and my now boyfriend of 6 months were messing around one thing lead to another and he slightly put his penis my vaginal canal(birth canal)

I'm not on birth control because I'm under age and my mom refuses to let me even tho I need it for health reasons. I have Pcos.

So he only was in my for about a min and didn't cum and had precum on his dick but wiped it off before entering me.

I know precum can get you pregnant and such. I'm just wondering how low/high the chances are. It's also rear the end of my cycle im pmsing and about to start any day now.