Final answer:
Probable or presumptive signs of pregnancy include breast tenderness, amenorrhea, morning sickness, and quickening, but these are not definitive on their own and require clinical tests to confirm pregnancy.
Step-by-step explanation:
The probable/presumptive signs of pregnancy are conditions that may indicate pregnancy but are not definitive on their own. These signs include:
- Breast tenderness: The area around the nipples may become particularly sensitive. This is a result of the hormonal changes during pregnancy, particularly the increase in estrogen and progesterone.
- Amenorrhea: Missing one or more menstrual periods is often one of the first signs that a person may recognize as an indication of pregnancy.
- Morning sickness: Nausea and vomiting, which can occur any time of day despite the name, are common symptoms due to increased pregnancy-related hormones and decreased intestinal peristalsis.
- Quickening: The first movements felt by the pregnant person, typically not until the second trimester.
It's important to note that while these symptoms can suggest pregnancy, they are not conclusive. A clinical test is required to definitively determine pregnancy.