As the hormone progesterone increases in your body, your digestion slows down. Plus, you're probably getting extra iron in your prenatal vitamins. Together, these increase your risk of constipation. What's more, constipation contributes to hemorrhoids -- another not-so-pleasant perk of pregnancy. While your body shifts gears to focus its energy on your baby, give it a helping hand. Eat a high-fiber diet and drink a lot of water to ease pregnancy constipation.