Which of the following is NOT a presumptive sign of pregnancy?

Chadwick's sign is not classified as a presumptive sign of pregnancy; rather, it is considered a probable sign. Presumptive signs are those symptoms reported by the patient that are subjective and not easily verified by a healthcare provider. Fatigue, breast changes, and nausea and vomiting can all be experienced by a person and suggest the possibility of pregnancy, but they are not definitive.

In contrast, Chadwick's sign refers to the bluish discoloration of the cervix, vagina, and labia due to increased blood flow and is observable during a pelvic examination. This sign can be noted by a healthcare provider and is more indicative of pregnancy than the other symptoms mentioned, which rely on the patient’s self-reporting. Thus, it does not fall into the category of presumptive signs since it can be assessed through clinical observation.