Pregnancy Scare

Hello.So i'm 15 and i have bf who is also 15.We're both virgins.I've never done oral or anal i he hasn't fingered me(only touching my 🐱 over my pants.I have OCD and this led me to pregnancy scare.I know lots of girls have it.Please help me how to get through it.I always think that somehow the sperm will go through my pants,then my underwear and then my vagina.There was one time where I was touching his dick and i had some pre cum on my hands.It was dried but didn't washed my hands(i actually don't remember) and get lunch and then i did some clit masturbate.And now i am still nervous that i can get pregnant.I'm scared.Pls don't judge me i know how pregnancy works but with this pregnancy scare i get panicked over anything i do with my bf.I'm feeling sick now and when i look at my belly i thing like ,,omg it is growing".Please help me and if it is needed please tell me how can i get pregnant without having sex.For example is it possible to get pregnant if he fingers me with pre cum on his fingers.