I had the exact same experience as Annarie. Internal pip four days before, small external pip, hatchmates all done for days. Was about to pitch the remaining eggs and clean out the incubator when I heard a peep.
We took off the the top of the egg, peeled a bit of the shell until we got blood, and just put it back in the incubator, figuring what would happen, would happen. To our shock, it hatched that night. Smaller than the others, but doing well so far!
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Sounds like maybe you tore a bit of the membrane, which contains active blood vessels that are still attached to the chick/duckling.
I had to help a duckling out of the shell last week. He'd internally pipped four days before, made one tiny pip in the shell, and then made no progress at all. His hatch-mates had all been finished for almost two days. It took all day of wetting down the membrane, chipping away bits of shell, being very careful not to tear the membrane, as it still had a little network of blood vessels in it, before the blood vessels finally dried off/were absorbed, and I was able to tear some of the membrane away without causing the duckling to hemorrhage and bleed out. Once the duckling was able to get its head out, I wrapped the egg in a warm washcloth in the incubator and let him finish hatching. He's a bit small, but thriving today!
