The first sign that I had of a hatch was an empty halved egg shell lying beside the hen's tail. Yes you have a little one hatched and it is under the hen keeping warm and possibly even drying itself off. It will make its appearance when it is ready.
Congratulations!
e Can't believe so many hatched on day 20. Am I counting wrong? I set the eggs on 3/1/13 at 6pm. Isn't today day 20?
pics please 