In a normal pregnancy, the egg and sperm unite in the fallopian tube to form a fertilized egg, which is transported to the uterine cavity by peristalsis and cilia of the ciliated epithelium, where it lays in the lining of the uterine cavity and continues to develop. In contrast, ectopic pregnancy is a fertilized egg that lays outside the body cavity of the uterus, including the uterine horns, cervix, fallopian tubes, ovaries and other organs of the abdominal cavity, with the most common site of ectopic pregnancy being the fallopian tubes. In both normal and ectopic pregnancies, pregnant women experience menopause, a delay in the onset of menstruation. With the prolongation of pregnancy week, pregnant women with normal pregnancy will have early pregnancy reactions, such as fear of cold, dizziness, weakness of limbs, drowsiness, loss of appetite, dislike of greasy food, preference for sour food, nausea, morning sickness, etc., which mostly appear in the sixth week of pregnancy; ectopic pregnancy mostly occurs after pregnancy with rupture and bleeding or miscarriage, and before the occurrence of rupture or miscarriage, patients with ectopic pregnancy will also have the above early pregnancy reactions, which are not significantly different from normal pregnancy There is no significant difference from normal pregnancy. However, the fallopian tube is a slender tubular structure with limited space. As the pregnancy continues to extend, the enlarged embryo may squeeze or even penetrate the wall of the fallopian tube, causing intra-abdominal bleeding and abdominal pain, while most pregnant women with normal pregnancies do not experience abdominal pain and vaginal bleeding. Usually, an ultrasound examination at 6 weeks after pregnancy can determine whether the pregnancy is intrauterine or exclude ectopic pregnancy. Because ectopic pregnancy is prone to tubal rupture, and once ruptured, it often faces serious intra-abdominal bleeding, which can cause fainting and shock, and even endanger life. It is recommended that pregnant women should have an ultrasound examination in time to determine whether the pregnancy is intrauterine, instead of relying on symptoms alone.