All patients gave informed written consent after being informed of the details of the study. Participants were permitted to take analgesics when severe or difficult to control pain occurred. Participants were randomized into either the LLLT or placebo control groups at the third visit. All participants underwent demographic and history taking, a physical examination, an obstetrics and gynecology examination, ultrasound, and laboratory tests. All participants were educated on how to use the device by demonstration and a picture-guided user manual.