We just finished incubating 2 eggs that were fertilized but didn't make it to the end but then that same day those 2 were appeared to hatch we found another egg in her nest and put it in the incubator. It never developed any. About 2 weeks after that we found 4 more in her nest. Today thay are at day 5 in the incubator and only one of the four is showing any signs of development. For the past 4 days she has laid an egg every day and we just keep adding them to the incubator. The one that is on day 4 is also showing signs of development and the other 3 haven't been in the incubator long enough. Is it likely these remaining eggs are fertilized or that if she continues to lay every day those will also be fertilized? How does duck reproduction work? How many eggs will be fertilized by mating one time and does mama have any control over which ones have a chance to be fertilized and which ones won't be? It stinks to have her laying an egg every day and then incubating them to find out that half of them are infertile.