hatching eggs

Out of 12 eggs in incubator only 3 hatched. Lovely three though. End of the 3 extra days for latecomers. So decided to look in eggs to see what went wrong. Three fully formed, one of which gasped and died as we opened shell !!!. I am mortified now. Should I have given it even longer ?, or would it have died anyway ?. Downside of incubators I guess, or trying to hatch altogether. I may have one more go later on in a couple of months time. But then again that was so distressing seeing that little one gasp.  

Thank you very much for your comforting reply, I have been feeling really bad about it since. Picture attached. Three of our new ones plus three 2 day olds we were given. Ours that we hatched are 1 gold silkie, 1 brown leghorn and one we are not sure yet but has distinctive black legs. The ones we were given are pekin bantams.

soooo cute 

Awwww