Job Advice

So, I left my previous job in December, got pregnant in January, and have been slowly looking for employment. Well, I was offered a job today and I accepted and I'm currently 20 weeks. I have not told anyone at the new place that I'm pregnant yet, however I obviously plan to. Im technically considered high risk, but everything is going great. Advice on when and how to tell them? I don't want them to think I straight up lied, but we really didn't tell many people until a couple weeks ago.