Eggs

Question
My society finches recently (5 or 6 days) layed eggs. I don't know if theyre boy and girl but one does a weird chirp from time to time. How do I know if they are going to hatch? and What else do I need to provide besides nesting material?

Answer
Boys usually makes more noise than girls. Also, sometimes you can catch them mating. If you do catch this, the male is the one on top.
A good way to tell if they are fertile is to wait a couple days and shine a powerful light through the egg. If you see something forming then you have fertile eggs.
Don't forget that two females still will lay eggs as well