Period is 19 days late, 3 negative home pregnancy tests, headaches, excessive discharge that soaks my underwear, change in bowel movements, nausea occasionally, slight cramping, mood swings, what could this be?

Doctor can examine: A vaginal discharge is anything coming from the vagina that is more than the scant amount of normal mucous that healthy women have. A discharge that has odor is usually an infection with germs such as bacteria, trichomonas, gonorrhea or chlamydia (discharge gets worse as infection gets worse). A woman with a discharge should see her doctor for an exam and meds, and avoid sex until then.