I have a hen who has had an egg in her oviduct now for nearly a week. I know its there because I can feel it through her abdomen, and I can squeeze and move it around. I haven't tried to remove it yet, because she doesn't seem to be in distress. She is perky, eats/drinks, runs around the coop etc, and there are no signs of her being in pain. How long can she keep it in there before I start seeing problems? She is just starting to lay again after a long winter break.