Redriver is right about internal pips. Of course, you can't see one without candling. But at this point you don't want to take them out of the incubator. The most obvious sign a chick has internally pipped is chirping coming from inside the egg. From internal pip to external pip can take several hours, or even a day or 2.
Here are a few of the chicks all dry and fluffy! I have 10 hatched, 3 pipped out of 22 eggs.
Here are a few of the chicks all dry and fluffy! I have 10 hatched, 3 pipped out of 22 eggs.