Scared of announcing pregnancy to mom.

I’m 27. I’m almost done with school (well another year left) and I’m scared to announce to my mom because my family are all professionals and she’s been on me because I’m a bit older and barely getting done. I live with her which definitely contributes to her wanting me to finish school, but she doesn’t want me to move out with my boyfriend. I don’t know if I should announce it in front of my sister in law and my brother because I don’t want to be embarrassed if my mom isn’t obviously happy. My mom can’t hide her emotions well so if she’s not happy, we’ll all be able to tell, she’ll make faces not on purpose but it just comes naturally for her.

I’m thinking of just telling her later on in pregnancy but she might be mad if I tell other people before her.

This would be her first grandchild. She has mentioned previously if any of us have a baby she won’t be a babysitter to it.

EDIT: for the people saying my mother is mad because she’s going to have to raise the baby, False. This would be her first grandchild, and knowing who and how my mother is, I know she knows she won’t be caught raising a child. I’m not a single mother, I have a loving partner who is ready to be a father, my issue is more so dealing with a religious mother who doesn’t want me to move out because I’m not married and which is why I’m afraid to tell her I’m pregnant. It has NOTHING to do with money as I make my own money and my partner makes good money.