Hi. I have 3 hatchery chicks who are now 9 weeks old. 2 Sussex and one barred rock. The one BR , I think she has her neck pulled in more, and there might be some clicking when she breathes. Otherwise normal , eating, drinking, and occassionally playing. They were quarantined for 6 weeks in the house, and then moved to a shed 3 weeks ago with no contact yet with other chickens, but in the run sometimes where there had been chickens, but no sick ones. Should I be worried?