Am I being petty?

Rachel • Momma to a 2 yr old baby girl and pregnant with my second
My husband and I told his mother that we are expecting. She didn't want us to tell anyone til after our Drs appointment to confirm my pregnancy, as she still was in shock and didn't believe it. Well come to find out she's told her mother and all her siblings, which I wanted to be the one to tell! It's my news not hers! I think pregnancy hormones are taking over..