So, we have 4 black aussies. Only one chicken has been laying so far, we got our first egg 2 weeks ago. So far, all of hte eggs have been blue/green. But today, we got a brown egg. I'm trying to figure out if a new girl is laying. My question is, will a chicken suddenly change from laying blue/green eggs to brown, or maybe do I have 2 hens laying at this point?