I have a pen with 5 pullets. Two have started laying. This morning I went to the pen and found a shell-less egg. I'm concerned that one of my laying girls is going through something. My other thought is that I could have another pullet beginning to lay. Isn't a shell-less egg common with new layers? I've put the calcium crumbles in their pen for choice. If it's one of the pullets already laying, how long will it take to get back to normal? If it's a new layer? How long does it take them to get it all situated and start laying eggs with shells?