My silkie hen has been sitting on my fertilized eggs for.....today is day 21. Set under her on the 5th. I have checked them a few times, candeled them, they look like day 18 two days ago. Movement in the egg. Today is day 21, no pipping yet, candeled a couple, slow movement. Hen is still sitting on them. Is less movement mean they are getting ready to pip? What should I expect? The egg is full with ano air sac on one end. I believe I see hair on ones leg. How much longer and do I need to do anything else. This is out first hatch.