Unprotected sex and birth control pills

So last night me and my boyfriend had unprotected sex. I’m on Blisovi fe 1/20 I take my pill every day at 7:20 am. But when he pulled out he came and I asked him about precum, he said that he held it down? I thought they couldn’t control if they had precum or not. Maybe it’s just like how some boys don’t know that we have a urethra lol by what chance is it that I could get pregnant?