Your best chances are within the first 24 hours after ovulation, but there is still a small chance two days after. So, honestly, if your ovulation really did occur on the 18th then your chances aren't that great because you would be past that 24 hour window, but I wouldn't say its impossible.
Cryptosporidiosis. Cryptosporidiosis is a parasitic disease that affects quail, pheasants, peafowl, waterfowl, chickens, turkeys, finches and psittacines (such as parrots). Cryptosporidia are poorly host-specific and can affect other animal species including humans, other mammals,...
Common Chicken Diseases and Symptoms in Backyard Flocks. Most medical conditions that affect backyard flock poultry affect the respiratory system of the animal. This particular system includes the air sacs of the body, the passages that permit the intake and outtake of air, as well as the lungs.