Wasn't sure what group to post this in but need constructive perspectives and advice, not negativity as that doesn't solve anything.

I just found out my 15 year old son is having sex. I'm not thrilled although I know it happens as my sister got pregnant at 15. Unfortunately my husband is away for the next 7 months and the biological father- judge actually took visitation time away at one point and he has no custodial rights if that gives an idea to his helpful character. So I'm it. My oldest daughter waited till she was 19 and engaged so I haven't had to handle this before. I was a shy girl, wouldn't kiss a guy till I was 16, and was 17 before I experienced sex. In addition I live in a super small very judgmental town so even more than before, my family is hated and badly talked about which isolates me and my other kids a lot. So now I find out from it getting spread around school he and his on and off girlfriend has sex. I'm a pretty rational thinker but right now so overwhelmed and emotionally overwhelmed, I need a sounding board and outside perspective. Praying God helps me out. I'm at a loss.