My flock of (5 weeks old) 15 chicks and 3 ducks, plus 3 littler 3 week old chicks...I noticed a couple of the older ones sneezing today, got a little more concerned when I felt a wetness spray on me with one sneeze. They’ve been out in their heated coop with access to their not-heated run for about a week now, seemingly acclimating well. I live in the Pacific Northwest,warming up now with still cool/cold nights, but they’re in the warmth of the coop at night. They’re all eating non-medicated starter crumble because, ducks. When should I worry?