mind you people can be rather vague with their complaints, like "my knee hurts" without specifying whether it's like a muscle pain, or the tendons or the joints
likewise, when people say "i have a funny tummy" or "i have a pain in my stomach", it can cover a pretty broad area between the lungs and the legs, and if described badly could be just about anything
mind you, if a baby is kicking surely you know that a woman is not just 3 months pregnant, as was the diagnosis only a few hours before she gave birth