Sounds like your mom's move is compounding your worries and the two of you are close. I remember being stressed when my parents were planning to move away post retirement and was finishing college at the time. Sounds like your mom has bern a supporter of your choices along the way. She will continue to be and will still be around after your LO is born for a while until divorce is finalized.
You have a lot on your plate, however it sounds like you have done a good job balancing things. There will be a rough patch, but keep your supporters close and naysayers at a distance.