I candle at 7, 14, and right before lockdown.
My first hatch I candled way too much, but had the most successful hatch.
My second hatch I have only 1 out of 10.
My third hatch is hatching right now. I started with 12 at day 14 I threw 1 out because of it not ever developing. I have 5 hatched, but I think 1 might not make it. Also, of my 12, 5 are pullet eggs. Of those pullet eggs I have 1 that hatched and one that has pipped and is resting in the egg... It has been resting for 12 hours now... It is still chirping and moving so I am guessing it is fine.