please help!!!

so i'm 15 and a few weeks ago me and my boyfriend were fooling around but didn't have sex. he also didn't cum but did have precum on his dick that was touching my hip. this was one day before my fertile window and it said i had 7% chance of pregnancy. this week i've been having weird symptoms like my nipples are way more sensitive than usual (they usually get a little sensitive before my period but it never starts this early and is never this intense) and for a couple weeks my stomach has been feeling weird like gassy and i looked it up and these are symptoms of pregancy. i'm not on birth control or anything so i'm wondering if there was precum on my hands and i adjusted my underwear and it got into my vagina. i know i'm probably just being paranoid but i need to know if this is even possible.