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Looks that way! Any progress? When they pip internally they often start cheeping. Also be careful if holding the egg upside down as you don't want fluids leaking down into the air sack or disorient the chick.

Humidity works off of surface area and while a sponge might work, I would worry about it harboring bacteria in the long run. Try a shallow dish with water. I don't know what kind of incubator you have but in my Hovabator it doesn't take a lot of water to maintain 30-35% humidity.

Looks like a fertilized egg to me!