6 days after the menstrual period is clean and then there is bleeding, the reasons are as follows: 1, may be recently ate cold, spicy and stimulating food or work and rest time is not regular, often stay up late, strenuous exercise and other external factors caused by the menstrual blood a little bit of return; 2, may also be caused by ovulation bleeding; 3, the recent week if you have had sex, it may be the cervical contact bleeding caused by. If this happens just this once and the bleeding is not much, you can observe. If the bleeding is not clean for more than a week, it is better to come to the hospital, do ultrasound to see the situation of the uterus and adnexa, and do cervical cancer screening to rule out cervical diseases, and if necessary, take blood tests for endocrine six, to see if it is bleeding during ovulation, and then adjust the symptoms after a clear diagnosis.