Sex without condom while the girl is on the pill?

Alright so I’m blasting gear currently after being on a cruise we had unprotected sex a few times while I was in my cruise (never had sex with a condom) but my question is what is the chance getting pregnant while blasting gear and her being on the pill is there even any ? It really concerns me since I want to do bodybuilding very soon and I don’t want her telling me that’s she’s pregnant