Pregnancy

This might sound confusing but I’m just curious. I’m on the combination pill. I am HORRIBLE at taking it , Sometimes I go 5 days not taking it , sometimes I’ll go every other day, every 2-3 days not taking it. I’m all over the place. But I never got a period if I miss pills unless I’ve gone like a week without. I know people say missing more than 2 pills is risky and you can get pregnant but what if you’re not ovulating? Or can you ovulate and not get a period as well¿ Im not sure if that made sense but I’ve always wondered.