I right up there with you.
179cm tall, weighed 91kg proir to falling preg, and am now 101kg. Also get constantly told that i dont look preg. I am starting to now, but, i dont look how i imagined i would look at 6months.
I have been pretty happy with being told in a way that i dont look preg, says to me that i havent put on to much weight etc.
I do know that my boobs have seemingly taken up most of my weight gain - ****!! Probably the reason why my tum doesnt look big, cause they still shelted by my boobs!!!
SEriously, they not that bad, only D cup, prob should go to E thou.
Becuase we are tall, we just have more room for baby. Thats my theory. All babies prob roughly the same length, but, we got longer bodies to hold the baby, in compared to a small person, where its gotta go somewhere, so therefore sticks out more.

I am starting to in the last 2 or so weeks look more preg to the outside world, not just fat. I really want to get one of those "baby on board" signs to stick on my top, just to peoples know that i preg, not fat.