I haven't been able to get any to hatch but, I've had other issues come up. Someone else had a dozen of my eggs and her daughter screwed the hatch up at about day 15 by breaking an egg. One hatched. The others were on track up to that point. My last attempt at hatching the thermometer read to high but, the chicks did develope just was to cold to quite make it.
Hopefully, someone more knowledgable than us will step in.

Hopefully, someone more knowledgable than us will step in.