A pregnant client reports experiencing constipation during her second trimester. Which nursing intervention should the nurse prioritize to effectively manage her constipation while ensuring safety for both the client and fetus?

Constipation is a common complaint during pregnancy due to elevated progesterone levels, which slow gastrointestinal motility, as well as pressure from the growing uterus and iron supplementation. The safest and most effective first-line approach is encouraging increased dietary fiber intake, adequate fluid intake of at least 8 to 10 glasses of water daily, and regular moderate physical activity such as walking, all of which stimulate normal peristalsis without pharmacological risk to the mother or fetus. Stimulant laxatives such as bisacodyl or senna are generally not recommended during pregnancy because they can cause intestinal cramping, dehydration, and electrolyte imbalances; they should only be used short term if conservative measures fail and after provider consultation. Mineral oil is contraindicated in pregnancy because it impairs absorption of fat-soluble vitamins such as A, D, E, and K, which are critical for fetal development, and can also cause lipoid pneumonia if aspirated. Limiting fluid intake is the opposite of appropriate guidance; dehydration worsens constipation and increases the risk of preterm contractions. Therefore, the safest and most appropriate priority intervention is the non-pharmacological approach of dietary fiber, fluids, and physical activity.