Relaxin is next on the fab five list of early pregnancy hormones. This hormone plays a role in the ligaments and joints of the body. While Relaxin calms the pregnant body in some ways, it can also add discomforts in other ways. What is Relaxin? Relaxin helps to relax the muscles, bones, ligaments and joints in the pelvis in preparation for labor. This hormone peaks around 14 days of ovulation, . . .