im really tiny in weight and 165cm tall. with my last two pregnancies people (especially DH family ) constantly commented on how little my belly was and how "such and such" was much bigger at that stage... Obviously my body doesnt like to hold too much weight and both my boys were perfect when born, even though they were both under six pounds they fattened up very quickly. even the dr said my size was correct for my build.. i just got sick of defending myself in the happiest and proudest moments.

point is - dont take it personally, i think people just dont think first! as long as you and bubs are healthy thats all you should worry about..

CONGRATULATIONS and good luck!