i'm 18 & scared.

My name is Tia , I lost my virginity on 11.19 a couple days after my 18th birthday. The first time we didn't use a condom, the second we didn't either and the 3rd we did but it broke i took a plan b pill and took a pregnancy test. it was negative and i got my period and so on. So i'm just being really dumb about this whole sex thing, it's like once you start kissing it's like nothing can stop you and you just let a lot happen that's me the dumb one , who didn't even notice my boyfriend didn't use a condom the last time, so now i'm like 1? or 2 days late for my period, i looked up can plan b change your period it said yes it can , so that's what i'm just hoping , i just need help and i bought condoms i told him no more unprotected 💯✋️ i haven't had any cramping or anything! my mom knows nothing about me even losing my virginity , only my dad and stepmom knows.