My hens have gotten very noisy, VERY LOUD! They are now 18 weeks old.... I was told that this is a sign of a hen about to start laying... any truth in this? I have Red and Black stars, rhode Island reds, buff orb., and EE if it maters. They are in and actual apartment so I no that no dogs, skunks, or other critter issues that could be causing it. If it is a sign of laying how soon after they start this behavior do or can they start!