I have four 21-week old Barred Rock hens. 1 has been laying consistently in the nest box for the past week. 4 days ago I found 2 eggs but since then only 1 a day. This morning I went out and found this on the floor of the coop: Forgive the mangled appearance. I scooped it out of the coop before the hens could get to it. The yolk is intact and all of the 'white' appears to be there so I don't think any of them were eating it. The 'shell' is paper thin and appears to have ruptured when it was laid. Is this probably a first egg from one of my other hens and is this normal?