Hi, the separation between the tergites "only" says 3 things:
-Your pede is fat
-Your pede is fat because it keep eggs inside
-Your pede is fat because have a nematod infestation inside ( very less frequency, god save us:8o ):wall:
The molt is only know when your pede give up the food, and the molt is really near when your pede becomes a little pale in colour. You can't see it because the pedes usually do the molt proces unther the substrate.
Be patient, and your pede will tell you when is time to change the shirt.