Hmmmmmm having a thought

You all can judge me I don't mind nor will it phase me but honest opinions. So I had unprotected sex all of September specifically the 18th when I was ovulating. That weekend my SO and I split. I slept with someone else on oct 4. My due date is June 10th I'm worrying just a bit... Give me your thoughts. Dr swears I convinced in September my mind is just wondering.... Oct 8 I had a positive test.