Am I over reacting?

My mother is the only person who knows about my pregnancy. Every time I try to talk to her about the pregnancy and future things I’d like to buy she LOVES to remind me that I might misscarry. I was showing her my dream rocking chair and asking her if she’d be willing to drive me to get it when the time was right. Her response?

“Well it’s stupid to go buying things when you don’t even know if it’ll live yet!”

She knows every since I found out I’m pregnant that this is one of my biggest fears and she has actually put me in tears. I feel I can’t be happy around her for 5 minutes before she tells me it might not be viable! Am I being dramatic? I hear it almost every other day from her.