Help me I have no idea what to do

My SO goes away for work. He is coming home and I told him I won’t see him a lot cause I live with my parents and he lives with his. He says he will help me watch my nephew but he never does. I’m 30 weeks pregnant and since he is coming home I would like to spend some time with him. He tells me he doesn’t know cause he has to help his grandma. Which I understand it’s his grandma. I feel like he puts everyone else before me. Like it’s getting hard for me to bend down and even sit on the floor with my 11 month old nephew. I don’t know what to do.