Should you ramp up your running training when your healing injury doesn't feel like it does not hurt much worse while running?

As soon as the healing stress fracture gets a little bit stronger, you should start ramping up your fitness so you don't just lose all of your running fitness.

The big question is, is whether or not it's okay at that point to really ramp up training, keep running longer, keep running harder when it seems like the very mild, barely-noticeable foot pain isn't really getting worse.