Upset for no reason?

I had a miscarriage in December. When we got pregnant again in February, I decided I only wanted my mom, dad and sister to know until I was over 12 weeks. My husband told me to be careful because my mom would tell someone, but she promised and I just felt like I wanted her support. I’m going thru a lot this pregnancy due to being high risk and stuff.... anyway, my cousin wrote to me yesterday asking “what’s new” and “how’s life”. Right then and there I knew she knew. I asked my sister and she told me mom said something at dinner “by accident “ and made them promise not to tell me.

Am I upset for no reason? Would any of you be upset?