“Unprotected Sex” while on the combo pill

Hi everyone,

I just need a little reassurance and support from the community. I’ve been on the combination pill for several years now. Lately my bf and I have been having sex without a condom but he never finishes in me. I’ve never missed a pill and I take my pill at 5:30 am. I haven’t missed a period yet (knock on wood) since we’ve started doing this. I know I’m supposed to be protected since I’m taking bc but I’m always a little worried since I’m still young and in college. So I guess what I’m asking is how likely would it be for me to fall pregnant while on the pill and not using extra protection. I know this is stupid but I just would like some reassurance. Thank you!!