Ovulation had intercourse, about 10 days after there are three consecutive days of blood may be due to pregnancy, luteal insufficiency and other reasons. 1. Pregnancy: If the patient is pregnant, during or after the period of embryo implantation, hormonal fluctuations in the body, especially changes in estrogen and progesterone, may occur, and some small amount of vaginal bleeding occurs, but it can usually be relieved relatively quickly. 2. Luteal insufficiency: If pregnancy is excluded, the above symptoms may be caused by luteal insufficiency. After the follicle ruptures, if the luteal insufficiency causes insufficient progesterone secretion, persistent bleeding may occur about 10 days after ovulation. If the patient has the above symptoms, it may also be due to preeclampsia, etc. It is recommended to consult a doctor in time and complete the relevant examinations under the doctor’s guidance to clarify the cause of the disease and treat the symptoms.