The probability of an ectopic pregnancy occurring is generally quite low, with an incidence rate of about 2%-3%. An ectopic pregnancy refers to a fertilized egg that does not implant within the uterine cavity, and occurs outside the uterine cavity; the most common site for an ectopic pregnancy is the fallopian tube, followed by the ovaries and the abdominal cavity. These are the common sites for ectopic pregnancies. The main causes of ectopic pregnancies are chronic inflammation or congenital diseases, which lead to adhesions and blockages in the fallopian tubes, affecting the migration of the fertilized egg.