An ectopic pregnancy is an abnormal pregnancy and the chance of getting one is about 1%-5. Moreover, the occurrence of ectopic pregnancy is highly related to the woman’s own health condition. Patients with inflammation of the fallopian tubes and pelvic cavity are significantly more likely to have an ectopic pregnancy; those who have had an ectopic pregnancy before are several times more likely to have another ectopic pregnancy in the course of their next pregnancy than normal women. In addition, patients who prefer to take emergency contraceptives can also cause ectopic pregnancy. The main prevention of ectopic pregnancy is to prevent pelvic inflammatory disease. When tubal obstruction or hydrocele is found, it is important to actively treat it and not to take emergency contraceptive pills indiscriminately.