Digestion is slower and hence there's constipation. For relief, drink more water, juices and other healthy fluids. Avoid tea, which is a diuretric. Eat more fresh fruits, vegetables, and grains to provide roughage for your bowel movement. Do mild exercise regularly.
Prunes are among the best for providing roughage.
Consult a doctor if you need laxatives. This is due to the temporary retention of blood in the legs from the pressure of the womb. It's time to reduce your salt intake. Whenever possible, always rest with your feet up. Wear elastic stockings to improve blood circulation.