Yes get it checked with xrays.
I had a patella that wasn't tracking. They did surgery on it 15 years ago, now they just give you physio to strengthen the muscles that hold the patella in place.

Get your bike fitted. I went from having pains from my knees to my neck.
REALLY BAD Pains. The first ride after the fitting. Nothing but my knees and they were much better, which I know know from recent xrays, that I have Osteo Arthritus in the knees.

The fitting was free, but the cost of having a new bar stem and the bars cut to fit my shoulders and simple adjustments in the seat location were unbelievable improvements. I'd been moving the seat up/down but it wasn't enough on it's own.

good luck