I'm new to the BCM. Mine is a little over a year. Her first eggs were last year toward the end of the season. She had some eggs that were a beautiful dark brown and others that had dark spots all over the shell. Today was her first one and again, lots of dark spots all over. Plus the color of the shell is inconsistent. A bit lighter in one area than another. Is it pigmenation? Anything I'm doing wrong? Anything to be concerned about?