Still injured

My knee was completely normal whilst walking, twisting, stretching etc. over the past week. But, alas, when I went for a run today to see how it would stand up to physical exercise, I only managed about half a mile or so before the pain came back - not as pronounced as last time, but still of an intensity where there was no point in trying to run through it so I quickly ended the comeback attempt. Thankfully there's been no after-effects during the day, so I'll rest up and ice and stretch for another week and try again next Sunday.