When did you tell work?

At what stage did you tell your work you where pregnant, I’m UK based. Just wondering when and if there’s a good time?

Edit: thanks everyone! I didn’t know the legalities with it!

I have a contract and good maternity and it won’t change what I do day to day, plus it’s all zoom now so no worries about showing haha! I was pushing for a promotion so I’m more thinking I don’t want it to hinder that, so would like to wait a little longer ❤️

Appreciate all your comments