You must have firm abdominal muscles. Your belly is gorgeous. I was one of those ladies that showed very early on. I was carrying a big baby boy with my first and I DID look like a whale. I gained over 60 pounds with that pregnancy. I had pre-eclampsia, so I was bloated with fluid. With my second baby, a girl, I had a baby bump the size of yours until about 25 weeks, then I really popped out. Every women is different, but all pregnant woman and their baby bumps, are so adorable. I know you're proud of that precious bump. You look fantastic, little momma.