Mother issues. I am pregnant with my fourth child. My mother and I do not have a good relationship. In fact?

she doesn't have a good relationship with anyone. I lived with her (an my husband and 3 children) up until a year and a half ago. We then decided to leave and move a 9 hour drive away. I am pregnant with my fourth child, and each time I told her I was pregnant, she was unhappy. I have been married for the past 12 years and my oldest child is 9. She told me she wished she had never had children in the first place. I do have something called adenomyosis, that may require a hysterectomy at some point, but should not complicate the pregnancy in any way. She tried to bully me into a hysterectomy, just over a month ago. Why do I feel such guilt in telling her. She is the only one who doesn't know I a pregnant. The reasn we lived with her for so long was because my dad died when she was 42, he was 48. We wanted her to keep her house, so we took care of everything. She is bipolar believe, and unmedicated. More on the depressed side. Thanks for your insights.