Not announcing to toxic parents

I’m currently 5w4d and I do not have a healthy relationship with my parents.

My mom and I did not have a good relationship growing up (extreme psychological and verbal abuse that crushed my self esteem). She’s technically still in my life but at a distance and I can only handle her in small doses. She absolutely denies she did anything wrong.

I am scared to announce my pregnancy to her bc she will announce it to the whole world and try to come off as super grandma to the world while I know what she’s truly like. I don’t want that toxicity around my kid when he/she is born. I was thinking of only telling her when I’m around 24 weeks (New years day) due to viability. If I miscarry before then she will throw a pity party with everyone and make it a whole thing when I’m personally an extremely private person with my personal affairs.

Any recommendation on dealing with toxic parents and pregnancy? I won’t even get into my narcissistic estranged but entitled dad in this post..