Hi TBW
This page has two links: Development of Chick and Candling Eggs. I think you'll find both of them very interesting ... I sure did! Just click on the links and they will take you to photographs. The Candling Eggs page shows pictures of the egg from incubation Day1 through to Day 17, for an Orange-Winged Amazon.
http://www.aviculture.org/Birds/id30.htm
I've never candled an egg, so I don't know if your eggs are fertile. However, from what I understand, if there is a "red thing" in them, they are. I'm sure someone with more knowledge will be along and let you know.
Abby