I have an EE hen who, often times, lays a double-yolker. This morning, she was in the nest, apparently laying. She seemed to be really straining. I had to take some cats up to the vet for shots and so left for about an hour. When I came back, she was out in the run, acting normal, but there was no egg in the nest. Could she be getting eggbound? Maybe I shouldn't worry until she starts acting weird? None of my EE have laid in the past few days, so I know she hasn't laid an egg for at least a few days... Any advice or should I just keep an eye on her?