Bacteria, viruses, and parasites can cause a wide variety of illnesses, and can infect any of the organs of the body. Viruses are often responsible for respiratory illnesses (such as the common cold) and digestive illnesses (such as diarrhea).
Disability will not pay for any more time off work than that for pregnancy. After that, many employers let you stay off for the full 3 months for maternity leave but the disability cuts off after 6 or 8 weeks, depending on how you delivered. That's not just how Aflac does it, that's how all disability works.
The most important requirement for short-term disability insurance occurs before pregnancy. The requirement has three parts. Buy the coverage before you conceive. A new policy will only cover accidents, unrelated illnesses, and future gestations.