That's probably just where the baby is at. That happens to me alot too, and when i press down on the hard spot;i feel him move away then the spot isn't hard anymore. Then again could be Braxton hicks if the hardening doesn't last long. Braxton hicks just feels like the baby is rolling up in a tight ball and the feeling doesn't last very long at all.
Yes. They are probably Braxton hicks contractions. You feel it harder on one side because that is where baby is located.
Its always on my lefts side that's hardening. I feel the several movementsbut not kicks lower my belly button too...