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,...
Pemphigus and pemphigoid are rare, autoimmune diseases that affect a very small percentage of the population. There are many different autoimmune diseases, and they can each affect the body in different ways. Pemphigus vulgaris, the most common of the pemphigus diseases, affects the skin and mucous membranes. Blistering may be accompanied by severe pain, itching, burning, and stinging.