Upset. Telling family about a miscarriage.

My fiancé and I found out we were pregnant early on. We picked a few people we would tell. I didn’t want to share with everyone yet as I just had a miscarriage a month prior and was afraid of another mc.

He told his sister who is also pregnant and 7 months along. We found out she had already shared this news with a family member. My fiancé and I had a plan of how we wanted to share this news and were upset she had already told her.

Fast forward. This pregnancy ended in a mc after six weeks. We were now trying to figure out how and when to break it to the ppl that knew we were pregnant. Only to find out his sister again had already told family members of our mc.

I am upset because I feel like this is my story to share when I was ready. Do I have a reason to be upset?

Should I have a conversation with her?