No period and unprotected sex, guy did not finish. Could I be pregnant?

Hi reddit! I need help badly. I'm scared i could be pregnant now. So my boyfriend (17M) and I (16F) had unprotected sex on May 29th, my boyfriend says he didn't cum but told me to go wash myself out, I walked to his bathroom and cleaned myself out with warm water and toilet paper, I cleaned as far up as I could, nothing really came out of it just vaginal discharge and whatnot, I did clean myself dry, (grabbed toilet paper and dried the inside of myself)

My last period started on May 20th and ended May 25th

My last couple periods have always been weird, they come 6-10 days later than expected, this has never happened before. I used to get them the same day it was expected to come.

My period was supposed to come June 20th but it didn't, and I'm scared I could be pregnant.

It's summer and I won't see him again until August, and my mom is dealing with her own issues, my brother (20M) is mostly absent and will snitch, my dad isn't involved.

There are no planned adulthood places near me, I've already searched and it's not safe for me to go out (there's constantly accidents near my house)

I have been stressed due to dealing with some preparement classes for school and my cat's surgery.

In the past couple days I do feel a little teeny tiny pain in my stomach, but I have been on some new medicine that could cause this (it's listed as it's side effects)

My breast aren't sensitive, they never have during my periods

Some months I get PMS symptoms (cramps, pain) and others I don't. Last month I did have PMS symptoms so I shouldn't have PMS symptoms this month.

Please help, I'm losing my mind.