When a woman has blood again three days after her period is clean, it may be a manifestation due to the return of menstruation, but it may also be abnormal uterine bleeding due to endocrine dysfunction of the woman’s ovaries, and some women with early menstrual cycles may be experiencing ovulatory bleeding. However, if a woman is bleeding after intercourse, this is three days after her period is clean, but we should still consider that it may be abnormal bleeding caused by cervical problems, for example, women with cervicitis or cervical polyps may show a small amount of bleeding after intercourse. Therefore, for women who have blood three days after their period is clean, they may have to go to the hospital gynecology department specifically to determine the specific cause of their bleeding by checking ultrasound and gynecological internal examination.