Week 4: Overtrained?

I have had sore knee this week that worried me.  Last year I had an operation to repair a torn meniscus and a repeat of this would put pay to my running ambitions.  I am hoping it is common condition known as Runner's knee and not a repeat of my meniscus problems.  Runners knee can be managed and does not necessarily exclude running.
I started the week with a 7km double tour of the local reservoir.  I was quite pleased, as my pace seemed faster, although my Strava recording went a little crazy at the end.  Unfortunately the next day my knees were sore, so I decided to give my gym sessions a miss this week.  Many beginner runners make the mistake of training too hard too fast.  This can lead to injury from overtraining.  Better to build up training slowly.  So I decided to let my knee rest.  I did one other run of 11km and I am pleased to say that the knee was okay.
In the meantime I am still working on my training program that has had to change because of professional constraints.  It is not easy to fit three runs and two gym sessions into a working week.