Are you mad about the bf changing his mind about the baby and asked you to consider an abortion because of his mother's influence?
If so, you are dead right.
The idea that your mother will choose and buy the nursery stuff is more of the same, imo. Same goes with his rationalisation of his mother's concern for his 'career'.
And are you interpreting his anxiety to have you smooth things over with his mother as an example of him bending over backwards to make mummy happy and being willing to throw you and your feelings under the bus?
Again, you are right to be worried if so.
Fact is, he letting his mother interfere in your relationship with you. She is Trouble. She represents a huge danger to your relationship with your bf, which is now the most important relationship her son has. He and mummy are finished as a couple, and they have been since you got pg.
He needs to choose now between his mother and you and the baby. And he needs to make it absolutely clear to his mother, in a showdown if necessary, that he chooses you and the baby, and his mother is to butt out of yours and his business. He needs to move out asap. It should be his first priority. Right now, he is living as a child, with the same expectations a child has about pleasing and placating mummy, and getting treated like a child by her. And apparently, he doesn't recognise this, which is a huge red flag.
You're not being one bit unreasonable in expecting him to cut the emotional apron strings. He is being an immature idiot to allow his mother to dominate him like this.
Someone like your bf is not going to grow up overnight, Girl123. I think you have a mummy's boy on your hands. I think you need to put your foot down and let the chips fall where they may. There are not many worse things than the prospect of spending your adult life competing with a domineering MIL.
Good luck.