Feeling down

So, lately my husband has been treating me like shit & I always put my foot down. I remind him at least 2x to do one thing, because he never does it. Today - I feel like I made a mistake on getting married to him. We have a 6 month old baby boy [Ethan] and I'm currently 5wks+3days pregnant. But I'm tired of his attitude and the way he treats me. I'm at the point where I want to start fresh and leave. I'm at the point where I want nothing to do with him. I want a fresh start. & I don't even know what to do anymore.