Hey ladies, I could really use some advice. So it's gotten to the point that I'm really showing now…

Hey ladies, I could really use some advice. So it's gotten to the point that I'm really showing now and I can't hide my pregnancy anymore. I don't know if I mentioned it, but my husband and son and I live with my parents currently until we can find an affordable apartment. My mom still is quite oblivious to why I'm getting "fatter and fatter" as the weeks go by. I know I have to tell her and soon. I've been lying and making excuses hoping we'd be gone by now but we're not and hiding it any longer would be pointless. my mother and I d o not have a good relationship at all. I mean she genuinely scares me (my childhood was not the greatest). Especially with how much she's voiced that I should never have any more children with my husband I'm terrified of her reaction. Any advice on telling her and maybe calming the storm after?