When did you announce your pregnancy at work?

I’m toggling between announcing to my grade level team 12 wks or waiting until after I get my genetic testing done & results back (everyone else will just have to figure it out on their own ). When did you announce or plan on announcing? And what were your reasons?

I technically don’t HAVE to announce at work at all being that I’ll only be about 4 1/2 months once school ends & doubt I’ll be showing by then. But dang, this is my first baby and I am bursting to tell the world!