I have been faithfully completing three runs each week and last Tuesday ran w6r3 albeit pretty slowly on the treadmill. I was due to run next on Thursday but we had a Sport Relief mile fun run at work(school) on Friday so I did that instead, planning to start w7 today. I don't know if it was because of the pollution levels on Friday, still pretty bad where I live, but I had to slow to a walk a couple of times so I was pretty disappointed. Straight after I started coughing and have had the beginnings of a sore throat and slightly tight chest since. I decided not to run this morning as I really don't feel right but am worried now that I will have set myself back especially if I develop a full blown heavy cold which is what its feeling like. What if I end up not running for a week? Its so frustrating but I am not fit enough yet to run with a cold. How far should I go back?