Women who have a small amount of blood in the leukorrhea on the day after sex have the following situations: First, it may be due to the overly strenuous action during sex, resulting in the rupture of small blood vessels in the mucous membranes of the vaginal wall, and there will be blood in the leukorrhea. Second, it may be caused by chronic cervical inflammation, during sex due to the cervix is subjected to stronger stimulation, there will be blood in the leukorrhea. Third, the blood may come from the uterine cavity, which is caused by a small portion of the endometrium peeling off during sexual intercourse due to stronger contractions of the uterus. Therefore, there is a small amount of blood on the second day after sex, and it disappears after 1-2 days, so you can observe it for the time being and pay attention to keep the vulva clean and hygienic. If the blood in the leukorrhea persists, it is necessary to go to the hospital to do gynecological ultrasound and gynecological examination work, according to the different causes of symptomatic treatment.