am new to chickens, the first round I bought were pullets and are not laying yet. I chaulk this up to just not being old enough and will start any day. Then I bought a roo and hen, they are light brahma bantams. She was laying before I bought her and has yet to lay for me. It's been 3 weeks. How long will it take her to get back into laying? Am I just being impatient?? And are there any signs to watch for on pullets before they start laying.