I think you should candle again on Sunday to make sure. Something doesn't sound quite right here...
So just to quickly update..... I'm approaching lockdown Sunday nite, but have only 1 egg that looks like a regular 15-16day egg should look like - dark shadows that take up almost the entire egg, good & clearly visible air sac, blood vessels too, and I've even see it's eyeball!!
But the concern is the other 14.... they look roughly like this egg does at approx Day 8-10. And to give due credit, it's not my pic.... it's from this link that Sally's posted in her webpage- http://chat.allotment.org.uk/index.php?topic=73884.0
What to do? Lock down for this one? Crack open one of the other 14 to investigate? Or just hope for the best with the remaining knowing that they'll come late, or mal-formed?
edited for grammar....
As long as you see veining I would leave them. Are you moving them around in the bator every time you turn?