What causes bleeding during ovulation in unmarried women?

The main cause of ovulation bleeding is follicle rupture and the subsequent drop in estrogen levels after ovulation, which can no longer sustain the normal growth of the endometrium, leading to breakthrough bleeding. If you have underlying endometritis, even slight bleeding may be followed by poor endometrial recovery, causing ovulation bleeding to last for more than a week and possibly continue until the next menstrual period. In most cases, ovulation bleeding does not require treatment, as it usually resolves on its own and does not affect health or fertility.