TwoChicksChix
Songster
If you're very worried that it has externally pipped and hasn't made any progress for a really long time, you can always, very quickly, pull the egg out and break off a small piece of the surrounding shell.
Just enough to see if the chick is vacuumed inside or if it still has blood vessels that are absorbing and aren't done yet. If the blood vessels are still absorbing, put the baby back in the incubator and let nature do its thing. If it hatches too soon it could break a vessel and bleed to death.
If the baby looks stuck to the membrane, ie. it's leathery and hard, not wet and a little flimsy, then coat your fingers in a decent amount of water and work on wetting the membrane around the baby and removing it as it seems to be easier to take off. Don't just rip it off as you can hurt the baby.
Just enough to see if the chick is vacuumed inside or if it still has blood vessels that are absorbing and aren't done yet. If the blood vessels are still absorbing, put the baby back in the incubator and let nature do its thing. If it hatches too soon it could break a vessel and bleed to death.
If the baby looks stuck to the membrane, ie. it's leathery and hard, not wet and a little flimsy, then coat your fingers in a decent amount of water and work on wetting the membrane around the baby and removing it as it seems to be easier to take off. Don't just rip it off as you can hurt the baby.