N92: Excessive, frequent and irregular menstruation

N92.3: Ovulation bleeding

The uterus consists mainly of a layer of muscle and a lining of mucous membrane (mucosal lining). The mucosal lining receives a good supply of blood and steadily increases in size. Unless an egg is fertilized, a large part of the mucosal lining is shed and replaced. The menstrual bleeding starts when the mucosal lining is shed. The uterus is connected to the vagina. During your menstrual bleeding the mucosal lining is discharged through the vagina to the outside of the body along with some blood.

You have experienced bleeding shortly after ovulation. Before ovulation the egg cells mature in the ovary. At ovulation a mature egg cell leaves the ovary. Ovulation is controlled by messenger substances. These messenger substances can also cause bleeding from the uterus.