Hello. I've Been Taking Birth Control, But I Missed The

Hello. I've been taking birth control, but I missed the second day of my first week of my new pack. I took it this morning when I remember that I missed it. However, I just had unprotected sex and my partner climax inside of me. I know how birth control works; I just need to know how high my chances are of getting pregnant, and what steps I would need to take to prevent a pregnancy from happening.