This is a helpful decision tool by familydoctor.org for common problems:
Based on the history you have provided, you should seek medical attention.
Hello and how are you doing? Is there any update with your knee? If this is still going on with intermittent pain, absolutely have it checked out by your doctor. Most common injuries after a fall are ligament tear, soft tissue tear, dislocations or fractures. Worth looking into if it has lasted this long.