Final answer:
Positive signs of pregnancy include weight gain, particularly in the breasts and abdominal area, nausea (aka 'morning sickness'), frequent urination, enlargement of the abdominal region in later stages of pregnancy, and a 'bloody show' when labor is imminent.
Step-by-step explanation:
The positive signs of pregnancy vary significantly, typically starting with delayed menstruation or a positive pregnancy test. Some other common initial signs may include increased body weight, primarily in the breasts and abdominal area. This weight gain results from the growing fetus and enlarged uterus, amniotic fluid, and placenta, as well as additional breast tissue.
There are also common physiological changes that occur in the body, indicating a positive pregnancy. These include nausea and vomiting, usually referred to as "morning sickness". Increased frequency of urination is another common sign of pregnancy. This is due to increasing hormone levels and blood volume in the body, which may increase by 30 percent during pregnancy. The respiratory minute volume in pregnant women also typically increases by 50 percent.
As the pregnancy progresses, the abdominal region undergoes dramatic enlargement, which is a noticeable sign of pregnancy. Furthermore, the skin may develop stretch marks, and there may be an increase in melanin production. A very definite and common sign that labor is about to begin is a discharge known as "bloody show", indicative of mucus plug expulsion.
Learn more about Signs of Pregnancy