Chances of being pregnant?

So I was wondering the chances of pregnancy if I took my Friday pill on  Saturday at about 12pm and then took my Saturday pill at like 9. Also, I'm taking Cephalexin and I read that it doesn't affect anything in several places.... Anyway, I took the Cephalexin with the pills like right at the same time. Then I had unprotected sex Saturday night/Sunday morning around 12am. Am I good? I would've had two pills in my system right even though they were late?