A fertilized egg that lays outside the body of the uterus is called ectopic pregnancy, commonly known as ectopic pregnancy, of which tubal pregnancy accounts for more than 90%. Among the many factors that cause ectopic pregnancy, tubal abnormalities are most directly related. Chronic tubal infections leading to partial obstruction of the uterine cavity, appendicitis, pelvic tuberculosis, peritonitis, endometriosis can lead to peritubal adhesions, tubal twisting, rigidity and umbilical atresia, re-adhesions after tubal adhesion separation, recanalization and cystostomy or scar stenosis at the surgical site can prevent the fertilized egg from entering the uterine cavity and thus implanting in the fallopian tube and leading to tubal pregnancy. IVF is one of the medically assisted reproduction methods. It involves fertilization of sperm and eggs in vitro, in vitro culture to develop into embryos, and then transferring the embryos to the woman’s uterus to develop into a fetus, which is commonly called IVF because it is fertilized in a test tube. Many patients choose IVF to help them conceive because of tubal adhesion or ectopic pregnancy, and believe that the process of sperm-egg union does not pass through the fallopian tube, so ectopic pregnancy will not occur. According to authoritative medical data, the incidence of ectopic pregnancy in IVF (in vitro fertilization) pregnant women is about 5-8%. Some patients have ectopic pregnancy in the first IVF and normal intrauterine pregnancy in the second IVF. The incidence of simultaneous intrauterine and ectopic pregnancies in IVF is 0.675%, and most intrauterine pregnancies can continue after removal of the ectopic lesion and fetal preservation treatment. The exact cause of ectopic pregnancy in IVF is still not well understood. The high risk factor is pelvic adhesions, but of course not all patients with pelvic adhesions will necessarily develop ectopic pregnancy. The possible reason for this is that the embryo usually remains free in the uterine cavity for three to four days after transfer to find the optimal site of implantation, and then the embryo settles and the pregnancy becomes clinical. If during this time the embryo wanders into the fallopian tube due to the microenvironment in the pelvis and does not return to the uterus, an ectopic pregnancy can occur. Therefore, neither natural conception nor IVF can prevent the occurrence of ectopic pregnancy. When you experience discomfort such as pallor and severe abdominal pain, please seek medical attention in a timely manner.