pregnant while a virgin?

i know that sounds bizarre, but try and bare with me. i have never had anyone to discuss these types of things before so naturally i am a bit ignorant. i have never had sex before, but i do know that you can pregnant from precum. january 5th i was in my fertile week and had messed around with my boyfriend, he understands my boundaries and knows that i don’t want to have sex until i’m on birth control. but he did enter me with his fingers, i am only worried because he did touch himself before he did me but i told him to wipe his hands off first with a towel to rid of anything that could possibly be on his fingers and he did. i’m still extremely skeptical since i was in my fertile. it’s 8 days before my period and my boobs are swollen and sore, but that’s not really uncommon. that usually lets me know my period is on its way. but part of me is still overthinking every aspect. do i have reason to be as afraid as i am?