Sorry to say your navel don't have nothing to do with the baby. The baby is in the sake and can be kicking your navel. But if the baby tug at its cord Idk if you will feel that.
The umbilical cord is hooked to their belly button which is then hooked to the placenta which for most isnt on your belly button unless there is an anterior (frontal) placenta.
I have had the same pain I wonder the samething