anxiety that’s irrational over pregnancy?

So i had sex two months ago with someone I shouldn’t have. I’ve had two periods since then with multiple negative pregnancy test. I then was later fingered a few weeks ago (which obviously doesn’t cause pregnancy). I’m doing a huge life change tomorrow moving somewhere i’m really about but somehow my anxiety is making me feel like I don’t deserve it? And my worst fear is to get pregnant so I keep having irrational anxiety thinking could I be pregnant from the sex two months ago or the fingering ??? Like it’s literally impossible but I feel like the anxiety over it just won’t stop and it’s making me stressed then like this life change that I want won’t happen cuz my worst fear you know? It’s super weird. I started birth control also now so that hopefully my mind will be at ease if i have sex again