Body weight is borne more on the medial tibial plateau then laterally. An undisplaced fracture
in this region runs the risk of getting displaced if you continue to walk on it before it heals. The fact that you have been walking on it already probably means it is a fairly stable fracture, but I'd advice using elbow crutches to offload the leg. So that you're not putting full weight on it. Even better if you can stay off that leg entirely for another 6 weeks. That will give it time to heal up completely; thereafter you can walk on it.