Why my belly seems so big

I also have asked my OB/GYN today why my belly seems so big and different compared to other pregnant women I see around ( I guess after a while you constantly see pregnant women around you ) ;)
She said that is most likely because of the belly muscles and skin. Especially with a first pregnany the belly muscles are still strong and the skin is tight and that is why I seem to "carry it higher" compared to other moms-to-be they have had previous pregnancies, their muscles are more lose and that is why the weight drops down more.

....interesting...I thought my belly muscles are not even existing until now ! haha