It might be, but don't give up!
I'm a beginner at incubating, just hatched my first 8 chicks last week. The first hatched at 20 days, very quick from 1st pip to running around. The next 6 were normal, hatching over the next 8 hours at 21 days, then there were two that were pipping and zipping, but nothing happened for 1+ more days. I had given up, put the 7 chicks in the brooder, turned off the incubator and went to bed, then was woken up by loud chirping. I thought it was the chicks, but it turned out to be one more tying to hatch - after having been silent for 12 hours! I had to gently help it out of the egg - I know we're not supposed to do that, but since I'd turned off the incubator, the membrane had dried out and was stuck to the chick in places, so though it only had a small chance, it definitely would have died if I'd not helped it out of the egg and gently rinsed off the stuck pieces with warm water.
Amazingly, it has survived! It was very weak at first and now only half the size of the others, so we have it in its own brooder, but it's fluffed up, eating and drinking, running around and looking good.
Out of all the dead eggs, there were several infertile ones, but 3 that were developed but never made it out of their shells. Two still had yolk sacs, but another was fully developed and might have had a chance to survive if I'd been more patient.
I think part of the reason was because when the first chicks hatched, they were walking over all the other eggs and turning them.
So don't give up! What I would do, after my experience but still a beginner, is wait another day, put the chicks you have in the brooder, take out any eggs with no pips at all, and give the slow ones another day or two.
. Could the accidental roll have be fatal?
