Little backstory here. So earlier this year my fiance and I decided we wanted to start trying for a baby. I had been open about this with my coworkers at the time. My boss mentioned numerous times without knowing much personal detail that she didn't think it was a good thing or time for us to have a baby. I found out I was pregnant shortly after and I was let go from my position without much reason and no notice given. I believe and I know it's illegal, but that she fired me due to me getting pregnant. I unfortunately suffered a miscarriage after they let me go. I then had a 2nd miscarriage in June.

Fast forward to now. I found out I was pregnant after my interview. I was offered the job and of course accepted. I started this week on Monday at 11 weeks. I'm very thin and this is my 8th pregnancy (3 living) and am already showing a small bump. I know I need to tell them soon, but am unsure what to do. I'm very nervous that I'll lose this job for the same reason. What should I do?

Bump pic from last week for reference.