I think it's silly for people to generalize about this...
For MY BODY, here's what I experienced. With all 3 of my boy pregnancies I 'carried low' -- meaning that it looked sorta like a pumpkin shape bellow the belly button.
For this pregnancy, my only girl one, I am 'carrying high' for me -- meaning that my belly is shaped more like a watermelon and the point of it is at or above my belly button.
I remember one time late in my last pregnancy. I got really tired of all the 'high' or 'low' pronouncements, so one day when someone told me I was carrying low, I replied, "no, that's just gas..."