If a woman does not have a period but has a small amount of blood in her vagina, the following reasons should be considered: 1. If a woman of childbearing age has a regular menstrual cycle and does not have a period when she should have one, she should consider the possibility of pregnancy and suggest a pregnancy test, preferably a blood HCG, which is the gold standard test for pregnancy. If the situation occurs in women of childbearing age with irregular menstrual cycles, it is still necessary to exclude the possibility of pregnancy, because there is no shortage of such women who are found to be pregnant after the use of drugs, and after determining the possibility of pregnancy, it is necessary to consider whether the menstrual disorder is caused by endocrine disorders, which also requires drug treatment and adjustment. 2. In most cases, this is due to endocrine metabolic disorders and requires medication to regulate the menstrual cycle. In the above cases, in addition to pregnancy, usually need a regular work and rest schedule and good habits.