I'm on day 21, with four pipped eggs but very little action after the pips. I do hear little peeps now and then, and if I get really close to the incubator (I'm thinking of trying to find my old stethoscope) I can actually hear little bitty intermittent tapping sounds.
I do NOT see the eggs move. BUT I look at the water reservoir and I can see the water surface wiggle now and then!! So that means there's movement in those eggs. Nothing dramatic, though.
Somebody else posted it can take 24 to 36 hours from the first peeping sounds to hatching...... I'm gonna hold that close to my heart, because I don't want to keep worrying that these chicks might die inside the eggs.