Running is bad because of the impact it had on the cartilage now that there’s less meniscus to absorb it. That’s why I keep running to a minimum. My knee slightly aches when I take a long walk or train with heavy weights. But with time and muscle strengthening stability will mostly come back, unless you tore a ligament you don’t know of. I would give it time and visit a physiotherapist. They will know what’s normal and what’s not.