One of my hens has stopped laying. I've narrowed it down as I only have 3. I've seen 1 hen lay at the same time every day and we also get one distinctive egg a day so 1 is definately not laying. We got them just over a week ago and the very next day all laid. Same again the next day. Since then only the 2 have laid. This has been constant though. Nothing seems to have happened that might affect 1 hen and being totally new to all this, I am wondering if there is anything I may have done or can do. Any advice would be greatly appreciated.