If it feels like menstruation but the vaginal discharge is like water, it could be pregnancy or it could be caused by another disease. If you have a history of menopause, it is important to rule out the possibility of pregnancy. If the menopause has not exceeded 35 days, it is best to go to the hospital to have a blood test for HCG to find out if you are pregnant. If it has been more than 35 days, an early pregnancy test can be done using morning urine to find out if you are pregnant. If you are not pregnant, it may be caused by cancer of the fallopian tubes, as the main characteristic of cancer of the fallopian tubes is a watery vaginal discharge, often accompanied by a mass in the lower abdomen. It can also be caused by a vesicovaginal fistula, which can only be diagnosed and treated after a detailed examination.