Got asked if I'd already had the baby...

I got asked today if I'd had the baby and when I said no I'm due in December the woman was really shocked and said but you barely have a bump I thought it was going and that you had had it and then laughed. I feel like my bump is just an average size and I'm measuring right with my midwife but it makes you feel like you aren't cooking the baby very well when you get told how small you are. It's happend a few times now comments like, ooh I can just about see your bump coming through and gosh you have a really tiny bump it's actually starting to bother and worry me but when I look in the mirror I feel like I'm huge!! Sorry ladies rant over!!