If you have a short abdomen, your bump will likely pop out sooner than for taller women with a longer abdomen. "Women who have a long abdomen may have more space for their uterus to develop upwards rather than outwards, which can give the appearance of a smaller bump," Wilson says. If you're smaller with less body fat, you'll probably show much earlier than someone with more body fat.
— that's the distance between the pubic bone and the top of the uterus. Typically, this number should correlate with your week of pregnancy. If, however, your fundal length is too high, it could indicate growth problems with the baby like fetal macrosomia, which is when a baby is significantly too large.