Chance of pregnancy?

I’m on the combination pill (tri-femynor) and my boyfriend and I had sex earlier today and he ejaculated on my stomach and some dripped onto my vagina. Now I NEVER let him finish in me even with behind on birth control, is there any chance of pregnancy this way though?I know pregnancy is possible at any time unless you’re 100% abstinent, just want to know thoughts on a scenario like this as I’m a very anxious person. Thank you.