The probability of an ectopic pregnancy returning to the uterus is almost zero. In clinical practice, the majority of ectopic pregnancies are tubal pregnancies, which have the following outcomes: first, aborted ectopic pregnancies, in which the gestational sac dies, mechanizes and is absorbed after abortion into the pelvic cavity. Secondly, rupture of the fallopian tube, which clinically requires surgical treatment. The third one is the conservative treatment after the discovery of ectopic pregnancy, such as oral medication, which mainly kills the embryo, slowly mechanizes it and finally absorbs it to achieve the purpose of treating ectopic pregnancy. Therefore, the probability that an ectopic pregnancy will return to the uterine cavity to continue the pregnancy is zero.