The fact a female is pregnant, is nobody else's business.
Your choice when to announce.
As both my babies' laid 'across me' no-one had a clue I was pregnant.
First baby announced at 6 months', & second, at 8 months'.
I was only working casually, at various workplaces with both, so no real 'pressure' to let workmates' know.
Family members' knew earlier.