If the results of various examinations in the first month of pregnancy only indicate that the pregnancy is in the state of pregnancy, but it is not yet clear that it is intrauterine pregnancy, at this time the left side of the abdominal pain should be vigilant for ectopic pregnancy, according to the results of ultrasonography, and it is best to be the results of the ultrasound of the transvaginal examination. If the ultrasound suggests that the corresponding adnexal region appears uneven echo mass, or other abnormal echo mass, we should be highly alert to the possibility of ectopic pregnancy. If the ultrasound or other tests do not indicate the possibility of ectopic pregnancy, but there is still abdominal pain, it is necessary to exclude whether there are corresponding urinary tract problems or gastrointestinal tract abnormalities, caused by the left side of the abdominal pain.