It could also be due to infection in the uterus, cervivitis,
vaginal infection. An ultrasound via
vaginal route or a uteroscope inserted via
vaginal route to look at the condition of the cervix, uterus etc, a PAP smear, a vaginal swab test, a culture of the vaginal discharge, a complete STD panel are probably what are required. It could also be an allergic reaction to soaps, cosmetics, douches, erasers etc that you use. Hence eliminate them one by one and see if it helps.