Well, I candled last night (I believe day 8, as I have my calendar reminder set for tomorrow as day 10). I roped my DH into watching, he had never seen eggs candled and was curious. 
One definitive unfertilized, which I'll toss tonight. Zero progress. 
The others, well, I think I just confused myself more. I referred back to the candling pictures in the reference files, but I'm not sure if what I saw was normal or if they might be quitters - and I didn't get any pictures, since I was trying to show DH. 
Shall I candle again tomorrow night? What might I look for in a day 10 candle?