Co-worker decided to announce my pregnancy for me.

I'm beyond livid right now and need to vent. A few weeks ago, I told a co-worker that I was pregnant since I thought she could keep a secret and she's one of the people I'm closest to there. I didn't want to annouce until at least 13 weeks due to my history of misscarriages, which she knows about.Well she got upset with me today for having a different opinion than her on black lives matter. (I live in a very small racist town) Well it pissed her and another co-worker off and they went out for a smoke break. When they came back in, she came up to me, in front of 4 other co-workers, and said, "It's getting very hard for me to keep your secret." One of my other co-workers asked what she was talking about. Then, right there in front of everyone, she decides to announce my pregnancy for me. I'm so incredibly pissed off and hurt right now.