As the title says really.
Ordinarily I wouldn't dream of telling them until 12 weeks and/or until after pay reviews.
However, I think they know already - I've had lots of medical appointments to go to (early scans plus booking in plus blood tests) - and I haven't been drinking at work dos. Plus, several years ago, I (stupidly) said to one of my bosses that I would want to start a family about now - and she has made it clear she remembers that conversation!
In this situation, I wonder if I might be better protected if I tell them "officially". They are reputedly rather paranoid about discrimination claims (it's a law firm) and so I wonder if it might actually work in my favour if I tell them "officially". If I don't tell them, but they have guessed, they can lowball my pay without there being any grounds for a discrimination claim - because there is no proof they knew.
So, should I tell them? Or am I overthinking the whole thing... ?