When to tell my work?

Tiffany • Christian. Mother of 3. 3 living and 1 angel. 10 years together married 7.
Hello! I lost my daughter in March. I found out I'm pregnant again and I'm 5 weeks along. I planned on waiting until 12 weeks to tell my family so they know all is going well and that they won't have to worry so much like last time. ( I bled at 8 week to 12, then at 16 weeks I had a placental abrution and 22 weeks lost my daughter).
However when should I tell my work? Which is also my family members?