Knee ache and pinching feeling

I had a more challenging long run where I ran at tempo pace. I stopped it short since my left upper part of the knee had a dull achey weak feeling (this was a little over a week ago). The next day the area right above my knee probably where my quad connects has discomfort when bending and sitting prolonged periods makes my knee feel worse. I’ve been resting and icing. I tried a slow run today, felt strong until around 3.5 miles in where I felt a pinching sensation in the same area on top of my kneecap and tightness/aches around my knee. Any idea what this can be? Can I continue running? Trying to make the best decision as I’m running the nyc marathon.