Two of my 15 BO pullets just started laying at 17 weeks. I know this is early. Today I found a broken egg just outside the door of my hen house. I didn't find any shell or egg white, just the yolk (unbroken) I also found blood on the roost and a little in the wood shavings. -not much, just pink stains. I am worried. I love my chickens. Is this anything to be concerned about?