Feeling the uterus

I'm 14 + 1. At my last two ultrasounds (one at 12 + 3 the other at 13 + 2) the baby was just below my belly button. This is my first pregnancy and I'm not that big so I was wondering if 1) it's normal for the baby to already be this high and 2) why I can't seem to feel my uterus. Any clues? I would have thought the uterus would be easy to find since the baby is already higher in my abdomen.