Add your comments to the bottom of this page. Start an exercise program early in pregnancy, one that includes stretches that strengthen and stretch muscles that support the back and legs. Swimming is a great choice for pregnant women, because it strengthens your lower back muscles, and the buoyancy of the water takes the strain off your joints and ligaments. Stand up straight. This gets harder to do as your body changes, but try to keep your pelvis tucked in and your shoulders back.
Pregnant women tend to lean back as their bellies grow, which puts more strain on the spine.
If you sit in front of a computer screen all day, make sure to sit up straight and keep your feet slightly raised off the floor on a footstool or other low object. Wear flat, comfortable shoes. As your belly grows and your balance shifts, a pair of high heels will only throw your posture even more out of whack than it already is. Always bend from your knees and lift objects and children from a crouching position to minimize the stress on your back. I am having problems with my sciatic nerve.