Mother-in-Law Probs-Help!

I have a question... My husband and I are TTC staring in a few months. That said, my Mother-in-Law try's to control, rule, take over every aspect of my life with her son. My husband and I both recognize this and HATE it! I have loads of horror stories with her, and I can only imagine when I get pregnant. That said, I have a question; would it be horrible to wait till I was 3 months along in my pregnancy to tell her or anyone else? That way I would know for sure, and if there was an early miscarriage I wouldn't have to hear her dog me about the miscarriage.