Should I stay???

I have my own apartment but my son and I stay at my mom's house every night. I work from home then after work we go back to my mother's house. I was thinking about moving back in with my mom to save money but she is very draining. Im 32 weeks pregnant and I also have a 2 year old son and I frequently need help with him being so active. I'm really lost to whether I want to move back because my mom always say negative things to me, she blames her depression on me if there's dishes in the sink or the house is a little out of order because of her grandchildren, she complains when I ask her to keep my son, she rudely tells me to clean up something that I was already going to do but gets mad if I don't do it on her time. I work from home at her house sometimes and she believes that I still have time to do things around the house while working. She's very money hungry. I was thinking about paying her half of what I'm paying for my place but I'm sure she'll want more. It's just me taking care or my son, his dad isn't in his life so it's really hard on me. I feel so lost because I want to move back to help my mom with her bills as well but she drains the happiness out of me.