Almost every woman can list backaches as a pregnancy related problem. Walking and swimming are good prevention exercises to tone and strengthen the muscles. Some women find relief with special support garments which lift the abdomen.
If you are having frequent backaches, take a look at your shoes. If the heels are too high they will distort your natural posture and can really be a pain in the back.
Try soaking in a warm bath or curling up with a heating pad. Herbalists often advise that a massage with St John’s Wort Oil is especially effective for relieving backache.