Swollen Knee

So I totally should have run yesterday cause I banged my knee yesterday and now it's swollen. I did run/walk today but only for 20minutes. My knee didn't hurt while I was running but I thought "I can't afford to fix it, so I better take it easy" I did get stopped by a land surveyor so I ended 30sec's early. My average speed was 11:55, 1.64 miles in 19:34minutes.