Am I over reacting

So I am on a lose dose birth control called Junel fe 1/20 and I usually double up on protection such as taking the pill right on time and never missing a dose and having my SO wear a condom. Well I never missed a pill and took it right on time but I have sex with no condom. Would you say my chances are slim to get pregnant. I probably am over reacting but I just get this feeling like did I really just made this huge mistake. I am at a point in my career to where if I have a child I could loose it all . So what you think??