You've canceled leaving the previous house? Or have I got the wrong end of the stick? If you're able to move back to your old home, great.
Don't look too far into the future - giving birth, visitation, etc.
The solution to the problems on that end is - cut him out of your life completely.
Don't put his name on the birth cert - if he wants a part in this baby's life, he will have to prove paternity and apply to the courts for contact. He will not be given more than a few daytime hours a week while the baby is breastfeeding.
Find someone else to accompany you through childbirth. You could ask a friend, a family member, or get a doula (a professional childbirth companion).
There is no need to worry at this stage about any of that.
Deal with one thing at a time, and don't get ahead of yourself.
The most urgent problem is simply getting you, your children, and your pet away from this man.
Second most urgent is finding furniture - if you're embarrassed to go back looking for furniture, do you have a friend or relative who could do this for you?
Talk to family and friends about what's happening in your life. People will be supportive.