What should I do? I think my mom got an abortion
Do you know why she aborted the child?
I don't know why would she do such a thing to herself?
I'm sorry you potentially lost a new sibling, but it is her body and her choice. You are free to think good or bad about that, but maybe she cannot support another child at this time and it was an accident. You can mourn for the child, but you have to respect your mother's decision.
I don't like the way you talked to me.
I'm sorry if I came off harshly, but you need to respect your mother's decision. Would you want to be judged like that if you found yourself in such a position? Think of how she must feel, and show her some kindness.