Bleeding after three days of intercourse is not implantation, and it takes six to seven days for the sperm to implant after combining with the egg. If the bedding bleeding usually occurs about a week after intercourse, three days after intercourse bleeding is considered to be ovulation bleeding, gynecological inflammation caused by cervical erosion, cervical cancer, but also may be endocrine disorders caused by early menstruation. So the vaginal bleeding need to go to the hospital for examination, according to the specific situation to choose the appropriate treatment. If you have intercourse without contraception during ovulation, there is a possibility of pregnancy, so you must be careful when you need to use medication after identifying the cause of the bleeding, so as not to use improper medication to affect the development of the fetus. If you are bleeding during ovulation, this is a normal phenomenon that does not need to be treated. Gynecological inflammation or cervical erosion caused by the need to use vaginal suppositories, the use of lotions to wash the vulva, such as Gelatin, etc., cervical cancer requires surgery.