The term “great aunt” stands for menstruation. Bleeding in the first week of pregnancy is the same as menstruation and may be caused by biochemical pregnancy, miscarriage, ectopic pregnancy, or other diseases such as hyperemesis gravidarum. 1. Biochemical pregnancy: The cause of biochemical pregnancy is still unclear, and it is considered to be due to a variety of factors, such as the woman’s age and the state of the uterine lining at one time. The patient will have delayed menstruation, increased menstrual flow, lower abdominal pain and other symptoms, so the patient will have 1 week of pregnancy bleeding like menstruation performance. 2. Miscarriage:Miscarriage can be caused by a variety of factors, including chromosomal abnormalities of the embryo, genital abnormalities and other factors. The main symptoms of patients are vaginal bleeding, menopause, abdominal pain, etc., so the patients will have the same phenomenon of 1 week of pregnancy bleeding as menstruation. 3. Ectopic pregnancy:The most common causes of ectopic pregnancy are tubal infection, abnormal development of fallopian tube and other causes, patients will have menopause, vaginal bleeding, abdominal pain and other manifestations. Therefore, patients with ectopic pregnancy will have the symptom of bleeding in the first week of pregnancy, which is the same as menstruation. 4. Other diseases such as hyperemesis gravidarum and uterine fibroids can also lead to the phenomenon of 1-week pregnancy bleeding like menstruation. Therefore, when the symptoms of 1 week of pregnancy bleeding like menstruation appear in the clinic, the patient should go to the hospital for examination in time, in order to clarify the specific causes of the disease, and follow the doctor’s instructions to take appropriate treatment measures.