Under normal circumstances, the embryo is implanted in the uterine cavity. If pregnancy occurs outside the uterine cavity, such as in the fallopian tubes, ovaries, cervix, etc., it is called ectopic pregnancy, medically known as extrauterine pregnancy.
Ectopic pregnancy is quite common, accounting for 3-5% of pregnant women. It is very dangerous and can threaten the life of the woman with ectopic pregnancy if the symptoms are not detected and treated early.