When should I worry

I’m kinda paranoid and I have bad anxiety but I’m trying not to let it get the best of me. I’m on the pill and take it perfectly. My boyfriend always wears a condom and pull out with the condom on before finishing. I know that getting pregnant that way is pretty slim, but pretend your me. Is there a time that I should ever worry that I could be pregnant or get pregnant. I’m pretty good at taking my pill so I don’t foresee that ever changing unless somehow my alarm stops going off. I just need some advice to keep my mind from spinning