Due to major surgery last year my stomach is still a bit swollen (not enormously). I am absolutely pissed off with people I have just met saying 'oh, are you pregnant' or 'when are you due'?
AIBU to think, if you don't know a person well and they're not obviously about 8 and a half months gone, just say nothing. It is really thoughtless and rude and I know I'm not the only person who has been upset by this kind of tactlessness.