how effective is bc?

so i’m on my second month of bc and it’s great so far, haven’t had any side effects that i really notice, my bf and i have sex regularly and we’ve never worn a condom or anything really, he’s very in tune with his body and i trust him, i was wondering how effective bc is if you take it at nearly the same time everyday (30 minute variation at the most)? he hates pulling out and i hate it when he has to pull out but we aren’t trying to get pregnant (don’t tell me that the best way not to get pregnant is not to have sex, i’m aware), i was just wondering what the odds of me getting pregnant are if i’m on Kurvelo. I have taken ovulation tests on days i should have ovulated this month and they were completely negative, just need some clarity and advice, no judgements please, thanks lovelies!!💞💞