What do I do if my zebra finches have eggs in their nest?

I've had my two zebra finches now for about 4 months. I'm not sure when they started mating or when all the eggs were laid. All I've noticed is that the female has been in the nest whenever I come home, but I haven't seen any eggs until today. Now that I've seen the eggs, I'm not sure what I should do. I feed them a store bought seed and dried fruit mix and spray millet. They also have a cuttle bone in their cage. Can anybody help me?