I know those of us who are larger sometimes show later or differently (it's differently in my case). My uterus and stuff pushes my belly fat up a bit and actually makes me look farther along than I am (6 weeks). But I didn't start looking like this in my first pregnancy until almost 5 months!
I will mention that before I found out I was PG my boobs did stick out farther than my belly and now I can't even suck in my belly to get them to stick out farther!!!