Pregnant and newly single

Me and my ex both agreed and planned to have a child he has been wanting a child for years now. Finally I felt we were both ready and i agreed and now that I'm pregnant it's like a switch has flipped and now he only cares about himself and his feelings. I feel I haven't been able to enjoy my pregnancy because everyday I'm dealing with a different mood or different problem I just don't know if I should stick it out or move on and plan to do this on my own. In all the years we've been together I have never seen this side of him I don't know where it's coming from or how to handle it.