On 9/21 i fell & landed on knee. pain 7/10 slightly swollen & bruised. most painful when bending & going up n down stairs. should i see a dr?

Not a bad idea: If the pain is not getting better and the swelling is not going down with regular icing (15 mins every few hours), you should have an xray. Most likely, your symptoms will improve as the swelling goes down.

Knee pain: Moderate to severe post traumatic knee pain aggrevated by bending , going up snd down stairs with swelling and bruces should be evaluated by a doctor first followed with appropriate investigations and treatments.

Have it evaluated: Have it evaluated by a professional. Depending on the severity of the injury treatment options include: bracing, casting, physical therapy, injections, and surgical repair.