I don’t know what to do I’m scared

So I’m 17 I got really really drunk and got raped by this 24 year old guy who I didn’t even know my cousin had him drop me off at her house after the pool party and I still don’t remember the night I remember parts but i remember him saying “ I’m about to nut in you “ mind you I’m ovulating at this time and later that night my boyfriend picked me up and we ended up having sex and he always nuts in me ( btw I’m not trying to get pregnant or anything just being young and dumb I’m getting on birth control tomorrow) but how do I tell my boyfriend and what’s the chance I’ll get pregnant and even if I do get pregnant I’m scared it’s not by my boyfriend I have the guy on snap and my cousin had his number but he’s blocked me and her in everything and we can’t get in contact with him anymore I asked him did he nut in me and he said no with 🤣🤫🤷🏽‍♀️ I’m so scared and crying I don’t know what to do