According to American Journal of Obstetrics & Gynecology
In a study, women who had pressure needles held in place with tape at three acupuncture points in their ears for one week, were more likely to experience significant reductions in lower back and pelvic pain than those who had the needles placed at three "sham" points or women in a control group who didn't get real or fake acupuncture.
Source:ABC health
Does acupuncture really helpful to pregnant lady in lower back and pelvic pain?