I have a pekin duck that started laying the first of sept. and she has been laying a egg every day until wednesday. On tuesday her egg didn't have a shell at all. We had to clean her nest and make a new one. I didn't expect her to lay for a few days after that. She didn't lay wednesday but on thursday she laid a normal size egg and one about 1/2 that size and it was flat on one side. She didn't lay friday but today she layed 2 normal size eggs. Has anyone every heard of ducks laying 2 eggs every other day?