When a woman who is sexually active experiences no normal vaginal bleeding when she should have her period, but only a small amount of blood, the first thing to consider is whether the abnormal small amount of bleeding is due to pregnancy and not a real period. Therefore, it is best to go to the hospital gynecologist to check the blood HCG to confirm whether the spotting bleeding is due to pregnancy. If you are not pregnant, you should consider whether the small amount of bleeding is caused by irregular menstruation, which leads to irregular endometrial flaking. It is recommended to check the ultrasound to see the thickness of the endometrium, and then consider whether to take progesterone to allow the endometrium to flake off completely for menstruation. If the blood is not coming out of the uterine cavity, but is caused by cervical problems, go to the hospital gynecology department to check the condition of the cervix, and then do CT to investigate cervical lesions and cervical cancer.