Higher levels of progesterone cause softening and stretching of the ligaments, particularly in the pelvic joints. The ligaments supporting the spine also relax putting extra strain on the muscles and joints of the lower back.
Bad posture will also contribute to backache.
You can counter this by:
1. Good posture and exercises to strengthen the spine.
2. Wear low healed or flat shoes.
3. Make sure that your mattress is firm.
4. Avoid heavy lifting.
Chiropractic manipulation and massage will offer you relief to you and your baby by safely realigning the spinal and pelvic joints.