What is one expected metabolic change related to fluid levels during the first trimester of pregnancy?

During the first trimester of pregnancy, an expected metabolic change related to fluid levels is increased fluid retention. This is primarily due to hormonal adjustments in the body, particularly the influence of hormones such as progesterone and estrogen. These hormones not only help maintain the pregnancy but also promote the retention of fluids to support the growth and development of the fetus.

Increased fluid retention is crucial as it contributes to the overall volume of blood circulating in the mother's body, which expands to meet the needs of the developing baby. Additionally, this retention supports the formation of the amniotic fluid that surrounds and protects the fetus. This physiological adaptation is a normal part of the body's preparation for pregnancy and ensures that both the mother and fetus receive adequate nutrients and support.

In contrast, other options such as decreased fluid retention, stable fluid retention, or fluid loss due to nausea do not accurately reflect the body's metabolic response during this period. Instead, they overlook the essential role that increased fluid levels play in a healthy pregnancy.