Withdrawal + pill? Paranoid...

Just had sex for the first time with my first college boyfriend!! We are both in college but are somewhat reserved people so we waited until we thought it was right.

Anyways, I’m on the pill (combo) and I take every single day and have never missed a day but I have been a few hours late every now and then. We had a couple rounds of sex, he pulled out and then I got a little paranoid that I am going to fall pregnant now because we didn’t use a condom. If it matters — my placebo/period week starts this upcoming Sunday so I don’t think I’m ovulating right?