Husband is a mommas boy

I can't get my husband to leave his mom for nothing. We have been married for three years and lived with her that whole three years. We did have our own place before we moved in with her and honestly I don't know how we got here. Now I'm almost 8 months pregnant with our first and she still is number one in his life not even threats of me leaving with our baby has changed his mind. I'm done trying. Of course I can't work right now but I'm going to live with my mom and find a job shortly after I have my son so I can take care of us. Of course this is never how I imagined my life or my child's life to be but I can't stay with his mom anymore she doesn't like me and never wanted us to have a child anyway.. I can't keep coming in last and I'm giving him the most precious part of me. I've given him everything and I'm still not enough.. Breaks my heart my son won't have a family environment from the beginning of his life..