yeah it's rude, but as everyone else has said, it's kind of par for the course when you're PG....
My MIL has annoyed me this time with her constant comments "are you sure it's not twins?"...yeah I'm big but I was with all the others too, in fact this time I think I'm a bit smaller...I just keep telling her she has forgotten what I look like when I'm PG. If it was twins I wouldn't be able to walk by now