I'm a worrier by nature but I need to know if it's warrented this time or not. Our Isa Brown started laying on October 11th, she was just shy of 16 weeks. So, I switched their feed to a layer formula and started offering Calcium. Last night when closing up the coop, no eggs were in there. This morning I found an egg that is not typical of what she has been laying, it is dull in color and the shell is very rough like a super fine sand paper, no sheen at all to it. Also, I saw something else on the floor that liked a very small (about 1 1/4 inch) oval shaped encased thing but when I reached to pick it up for a better inspection, one of the girls grabbed it and ate it. What the heck is going on!!! The girl that's been laying is acting now like she's going to lay so I don't "think" she's involved with either event. We also have 2 other Isa's (one just recently developed a large comb and wattles and redder), and 16 week old RIR's, Barred Rocks and Buff Orp's. Did I switch food too soon? Am I giving too much calcium? Should I be concerned? And what was that thing on the floor?