M.P.
Mothers are sometimes a difficult subject. You love them and you do not want to hurt them but at the same time you want to have limits and boundaries.
If it is possible I would suggest to have a conversation with her that ends the hard feelings, maybe she feels that you have not been considerate enough with her specially given that you were living at her place.
Being considerate, never hurt (at least not intentionaly) and treating someone as you would like to be treated is always a good idea.
Give it a thought, if you have someone, anyone, living at your place and they move out when their place is ready without telling you, how would you feel? As I see it, is not a matter of being your mother is a mater of basic consideration.
She does not like your boyfriend. That is fine, have a conversation with her ackwoledging that, but ask her to make and effort and give him a chance but overall to respect you and your decision. In a loving way make her understand that you are grateful for her concern but you would like her to help you maintain the decision to stay with the person you love and more because he is the father of your baby.
As a mother you can understand the neverending love that a mother feels for their kids and that no matter what age you are, you will always be her little girl. It will be impossible for her not to worry about you and what you do.
You are old enough to make your decisions and behave as you please and you do not have to ask for permission or tell her every move but you do owe her love, care and consideration and sometimes letting her know what you are going to do just will not hurt you.
I understand that you are now in your own place, the relationship could be a lot easier because you do not have the everyday contact. Now you can take control of yourself and allow the space to be caring and attentive to her, without feeling that is an obligation.
Particularly in the case of not letting her know when you were leaving, I do feel that she has a reason to be upset, I know I would, and not for controling, but if I offer my house to someone the minimum I expect is to receive some consideration and that person let me know and say THANK YOU when they are ready to move.
Have you asked your mother why she does not like your boyfriend?
I hope you resolve your situation with your mother in the best way possible. And I hope that your life is full of love.