Sad News....
I made a little candler, and I looked at 4 of the eggs through it. 2 I kept just in case. The 3rd didn't look right, so I cracked it, and sure enough it was about a 6 day old chick (embryo) with a circle of blood around it. So it was dead. The 4th also didn't look right, so I cracked it and it was rotten--never even fertile.
Then came the 5th one. It looked just like the first 2. But (silly me!) I decided to crack it any way, as I was sure it would be dead. So I did. And guess what? It was alive! The yolk was just going into its tummy. It was a perfect chick. It probably would have hatched tomorrow. The air-sack was not popped so the chicky had no chance--it died within a few minutes.
I guess it was a good lesson learned--and I guess it means those other ones will probably hatch.