I wish I had my own apartment

I live with my husband and his little brother and his mom and we have a little room and I'm 7 months pregnant. I'm really disappointed because I want to get everything ready for my little baby boy but I hardly have any space... I don't want to live with his mom she's always getting in our business, our arguments, and it really ticks me off.. His brother wants everything I bring and sometimes I just feel like I'm being greedy but it's not fair how I can't do much around here I feel so unwanted and uncomfortable I told my husband but he wants to live with his mom... Even if we get another apartment, she still wants to live with us.. And I don't really want that at all.. :(