What did the doctor tell you? I would definately wait to run at least 8 weeks. Do some cross training, and you'll be good to go in no time. Definately do not run at all though, if you are looking to heal as quickly as possible. If you run a little (even if you feel you can), your injury will linger on for a while.
For the record, it's usually very rare for a stress fracture to turn into a full blown fracture. The possibility is really really slim, actually. However, running on a stress fracture can definately make you need more time to recover from the fracture. They do hurt pretty bad, too.
I knew a guy who won the state cross country meet on a lingering stress fracture. It just hurt like hell.
For the record, it's usually very rare for a stress fracture to turn into a full blown fracture. The possibility is really really slim, actually. However, running on a stress fracture can definately make you need more time to recover from the fracture. They do hurt pretty bad, too.
I knew a guy who won the state cross country meet on a lingering stress fracture. It just hurt like hell.