I Am In Therapy Right Now For My Knee And

I am in therapy right now for my knee and calf. I tripped on a rug a couple of weeks ago and the calf is still sore when i walk. Sometimes there is a pull right in the bottom portion of my knee along with a pull like sensation in my calf. How long does it take for this to go away and do i need to be concerned about the duration of the pain/discomfort.