The bleeding two days after intercourse is not clinically related to intercourse, but is often caused by the following reasons: 1. endocrine disorders. 2. just in time to ovulate during ovulation, due to the decline in the body’s hormone levels, resulting in endometrial withdrawal bleeding, usually about 3-4 days will be completely clean. 3. due to inflammation of the pelvis, this situation is often accompanied by lower abdominal pain. This condition is often accompanied by pain in the lower abdomen. 4. Endometriosis and pelvic tumors may cause this condition. If cervical cancer screening has not been done within a year, it is also recommended to know the local condition of the cervix and do cervical cancer screening at the same time to exclude the possibility of cervical epithelial lesions.