My Boss Is Big-Mouth

Jessica • Baby K will be our first child together but 3rd in our little family. We are both as excited as can be.
I told my boss a few weeks ago as I work around radiation and needed to stop. She assured me her confidence and then Friday she told the department right next to her office. By Tuesday everyone knew and I was in tears. I've had previous miscarriages and she knows this. With additional reasons as well, I have the right to keep quiet. Anyway I contacted HR and they did nothing. I'm so stressed and angry. Has anyone else had this happened to them?