Knee pain and grinding/popping

On Christmas eve I felt very slight pain in my right knee when putting weight on it but didn’t think anything of it, then the next day it was hard to put weight on and it’s still like that. I can walk on it but I have to have more weight in the heel of my foot + need support from my left leg. Also when I put my hand on my knee cap, I felt grinding and/or a slight popping. Just wanna know if anyone else has experienced this or what it could be.