UPDATE: Well Henny-Penny has been doing great, I candled eggs last Friday (day 14) and saw movement in each egg (she has 4 under her: 2 from Silkies, 2 from Americana), I candled the eggs on day 18 but all I could really see was air spaces, the rest of the eggs were dark. Yesterday when Henny was off the nest I used my cell phone light to check the eggs, I didn't pick them up - I just shone the light beside the eggs, one I say LOTS of movement, the others had large air space but rest of egg really dark.
This morning I heard cheeping and just lifted Henny a bit to see if one hatched - nope all eggs intact, but definite cheeping. I couldn't tell from which egg and I didn't want to disturb the hen too much so I left her be.
How long from cheeping to pipping/hatching?