pregnancy scare! pls help

5 days ago my boyfriend and i (both 17) had unprotected sex for the first time because we didn’t have condoms and thought “it’d be fine”. so fine that we decided to do it two other times that day🤦🏻‍♀️ even though we thought “it’d be fine” we were still super cautious. he swears up and now he didn’t cum, i didn’t feel it inside me and i don’t think he’d lie to me. he swore he didn’t even finish himself off that day so there wouldn’t be a way of me getting pregnant due to left over cum. he says he doesn’t think he pre came but idk, do you feel when you precum? my boyfriend, two best friends and my boyfriends brother/ bestfriends boyfriend swear i’m not pregnant and that i’m stressing myself out and over thinking and that’s why my period is a couple days late. at the same time: i don’t keep track of my period, i’m just assuming i’m late bc i don’t think i’ve had it this month yet (but i rlly don’t know for sure bc i don’t remember) and if i haven’t had it this month, the months almost over so it should be coming soon. with the information i have and i’m giving to you guys, i know there’s not MUCH for you to tell me, and there’s very little to say to help me feel better bc with my situation it’s very complicated but anything to make me feel slightly better would help so much