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E. Musculoskeletal system: ï Muscles and joints: â¢During the first few days, levels of the hormone relaxin gradually subside. Ligaments and cartilage of the pelvis begin to return to their pre-pregnancy position. This can cause hip or joint pain that interferes with ambulation and exercise. â¢Good body mechanics and correct posture are important during this time to prevent low back pain and injury to the joint