I'm planning to live with my mom until January. My eldest son is there…

I'm planning to live with my mom until January. My eldest son is there, we're busy with the move and paperwork. I was thinking hypothetically, could I hide the pregnancy from my mom? We have good relations, but she has a complicated character. She had me caught in winter on a bench with a bag of candy ?‍♀️ (before that I didn't like them), then she pulled me out. Now I don't have any strong shocks yet, I would like to hold onto it until the sex determination.