Yesterday, one of our chickens laid something very strange, There seemed to be white mixed in with it, but it looked like a cooked yoke. What was it and what are we doing wrong. We have 3 hens and they look old enough to lay. In the last 6 weeks, we have had one shelless egg and then this. When will we get some eggs FYI: They were eating laying pellets, but we just switched them to Layena Crumble. They also get oyster shell. Thanks in advanced!