The presence of fresh blood on the next day after intercourse may be caused by irritation of the cervix, vaginal walls, and uterine lining during intercourse, which causes bleeding. When this occurs, it is important to treat the bleeding according to how much it is. If the bleeding is similar to the time when the menstruation has just come, or is about to end, it is relatively small, you can first take oral anti-inflammatory drugs, such as cephalosporin or amoxicillin, as long as you are not allergic to it, you can take it orally for 5 days to prevent infection. You should not have intercourse in the near future, and also pay attention to the hygiene of the vulva, and it will usually end in 3-7 days. If the bleeding is very heavy, go to the hospital and register with the gynecologist for a colposcopy or gynecological examination to determine whether there is any laceration of the cervix or vaginal wall. If the laceration is very intense, the laceration should be sutured to avoid fresh blood, which can affect your health. If it is not particularly heavy, you can fill the vagina with gauze and apply pressure to stop the bleeding.