I had a "dull" sort of pain a few inches below my kneecap round towards the inside of the shin on my left leg. It wasn't sore to press, but it was sore when putting weight on my left foot.
When I say "sore" it was way down the 1 to 10 scale. Probably the worst it got was about 3, so more "uncomfortable" than sore.
I'd convinced myself it was a stress fracture because it didn't feel muscular or anything like that. The GP was sure it was just a bit of muscle tissue damage (the muscles on the front of the shin "coming away" from the bone), which is the first step towards a stress fracture according to the google "research" I did. So, if I'd kept going with the same intensity, I'd have been risking a stress fracture.
Anti-inflammatory tablets from the doc seem to have already sorted it though. I'll not run for another few days though just to be sure I'm not going to aggravate it.
Mull of Kintyre HM www.mokrun.com (Unless something goes remarkably tits up, I will get a PB. My previous PB from 3 years ago is 1:54:xx after no training. I ran a comfortable 1:40:xx in training about 4 or 5 weeks ago).
Fraserburgh 10k https://sites.google.com/site/fraserburghrunning/ a couple of weeks later. It will be more difficult to hit a PB here because of the proximity to the HM and only about 12 weeks or so after taking 4 minutes off my previous 10k PB.