please no judgement

I am currently a stay at home mom and I have a 9, 7 and 21 month old. my husband and I recently wanted to have another baby but didnt think it would happen this soon. I tested today and it said pregnant. now I'm more than happy, but while living here in Maine we had to move in with my in-laws for financial reasons. my MIL expressed her concerns about us ever trying to conceive again stating she thinks we shouldn't do it period. hut of course it my life and my family. I'm dreading telling her because for one she will disapprove and two we live here. what if she kicks us out? what if she stresses me to the point that I have a miscarriage? I'm so nervous and scared when this is supposed to be a great moment for us. any ladies out there with advice?