How can a ultrasound help when having abnormal periods and vaginal discharge?

See the ovaries: Ultrasounds visualize the internal structures (ovaries and uterus) with great detail. It will help rule-out things like cysts on the ovaries and fibroids in the uterus.

Abnormal periods: Ultrasound and sonohysterogrophy can help determine if someone has a endometrial polyp or polycystic ovaries as well.

US: You can have a transabdominal or transvaginal ultrasound or even a more detailed test called a saline hysterogram. The last test takes a detailed look at the lining of the uterus and is excellent to see if the bleeding is related directly to endometrial abnormalities or the presence of polyps or fibrois.