Sexual intercourse caused by menstruation 2 days early is usually normal, if the vaginal bleeding often occurs after intercourse is not normal, need to go to the hospital in time to consult the doctor. Normal menstrual cycle, the menstrual period in advance or delayed no more than 1 week time, is a normal menstrual cycle, therefore, after sexual intercourse, menstruation 2 days in advance, is a normal phenomenon. Thereafter, we need to pay attention to observation, especially after intercourse often vaginal bleeding is not normal phenomenon, need to go to the hospital in a timely manner, by a professional doctor to give the relevant examination, including gynecological examination, cervical cancer screening, such as cervical liquid-based cytology, human papillomavirus detection, if necessary, feasible colposcopy, found cervical lesions targeted treatment. Women pay attention to menstrual hygiene, non-menstrual bleeding before and after sex, alert the existence of certain gynecological diseases, such as cervical inflammation, cervical polyps, endocervical neoplasia and endometriosis early detection, early diagnosis and early treatment, so as to avoid delaying the condition. If you have any other questions, it is recommended that you consult a medical professional for guidance.