Thanks for sharing your experience...
I'm 22 weeks and 4 days. I barely have a belly but the OF told me that his measurements are perfect. I had the same worry but he told me since it's your first that first time ms usually hold there baby in farther since there abdominal muscles are not torn from a baby yet
Its very normal. Remember every woman's pregnancy is different some women don't show until 3rd trimester. This is my third pregnancy and I'm 14 weeks and showing, but my cousin is 6 months and has no bump