Birth Control & Unprotected Sex 😬

Hey ladies! How many of you are on BC & have unprotected sex? I used to have unprotected sex with my ex all the time & he NEVER nutted in me. However, this guy that I'm dating has nutted in me THREE times already then asks me how accurate my BC is. I'm new to letting a guy nut in me & honestly EVERYTIME he's done it , he's made me nervous. I'm going to tell him to stop doing it but should I be worried that I can get pregnant ?