It's Not Pregnancy Related But Need Advice

I'm 20 years old I'm currently 28 weeks pregnant I also have a 5 year old boy I got pregnant at such a young age It changed my whole life around but I did the best I could I graduated started working and took care of my baby I started dating and fell in love with who is now my unborn baby's father... before I got pregnant we was having a lot of problems and financial problems also my mother who was the only one helping me with my son was worried so she said talk to me and said while me and my husband got settled she wanted my son to stay with her I said OK I would go every weekend to visit him try to be there as much as I can while we found a new home and settled down now my mom doesn't want my son to come back to me there's always an excuse I don't want to be rude or mean because my mom and son are so attached to each other but I want my son back I tried to talk to her and my husband is doing everything so my mom can see we are OK and everything change but my mom doesn't want for my son to come back I don't know what else to do I feel terrible about this I love my mother but I need my son I love my son