Most women deliver the baby somewhere between 37 and 42 weeks. As the belly grows, the lower spine curls to accommodate extra weight. We recommend you begin a new post. Sharp pains in the vulva are often associated with tensed muscles, which can be reduced if the muscles are able to relax. Of course you know labor hurts, but you may still decide to do it without pain medication, including an epidural. Possible causes of vaginal pain include the following:. But it also puts more pressure on her pelvis and bladder, resulting in frequent bathroom visits.