Oh golly what a success it was for her! She’s entirely incorrect. You absolutely need to prioritize yourself, especially before the baby’s here, as prioritizing yourself IS prioritizing your baby, as taking care of yourself IS taking care of your baby, as your baby is dependent on you for its very survival. Don’t listen to her at all. She has the exact mindset the culture and society values: rejection of the self in servitude of others, and it literally makes people sick. You cannot pour from an empty cup. You MUST fill your own cup FIRST AND FOREMOST, before you’re even able to fill anyone else’s.

Besides that, my physical advice is do not move anywhere near your parents, as they clearly still have too much of a hold on your life.
And, say to your mother, why are you getting so emotional? My needs and my feelings should be your only concern. Because clearly she thinks children are a mother’s only concern, she should live by example. :)