Krystala, what I have found successful in hatching eggs is that after the chicks hatch, I put them in a brooder for a couple of days to keep them warm and to let them recover from hatching.
If you don't have a brooder, a ten gallon aquarium with a screen and light (around 60w) on one side...
As I was cleaning out my Orpingtons coop, which normally lay jumbo brown eggs, I most recently observed eggs that are smaller than a fifty cent piece. Any ideas why?