Pregnancy/abortion HELP

I'm aware you're all going to yell at me, just please don't. Im 13 years old, 14 in a month, and me and my boyfriend were dry humping I guess you could say? He never came inside me, but I felt some like right beside my vagina and I'm completely terrified it could have gotten me pregnant. It wasn't cum, it was pre cum but I know you can easily get pregnant from that. I'm on a super weak birth control that's for acne, but it regulates your period and you usually get it 2-3 days after you stop taking it, and I'm just terrified I'm pregnant. Would you be able to tell if it's only been a week? Is there a certain age you need to be to buy a test? please help me, I know birth control can make it late sometimes but I'm so scared I won't get my period
update: I know it can't get you pregnant if not inside you, but it was so close I'm not sure if some could have dripped in or not. I'm just really scared and so is he