Hi, thanks for writing to HCM.
The fact that you are able to walk without any pain indicates that there is no fracture
in the knee joint.
You might have propably suffered a soft tissue contusion
which will settle down with Ice packing and with medications like Diclofenac
or Tramadol for a few days.
So, you can go for the examination and consult an orthopedic surgeon as early as possible.
Hope this information is helpful. Good day