Doubtful...
patella plica comes around during fetal development, not from falling on your knee. More likely options are bruising, fracture (hairline), and or strain of the quadriceps tendon. Since it's only been a couple of weeks I wouldn't worry about it unless it continues to persist or interferes with your activities. Have you been icing and elevating? Often, people neglect the first aid treatment and wonder why they don't show any improvement. Good luck!
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