Ectopic pregnancies can usually be detected by ultrasound and blood HCG levels about 6 weeks after blastocyst transfer. Women can go to the hospital for an ultrasound at about 6 weeks after the transfer to see if the gestational sac is developing in the uterus. If the gestational sac is not detected in the uterine cavity, abnormal hypoechoic areas are detected in the uterine periphery, especially the yolk sac, embryonic buds and primordial heart tube pulsation can sometimes be seen, and the blood HCG level is lower than that of intrauterine pregnancy, the ectopic pregnancy can be detected in time. If a woman experiences abdominal pain, menopause, vaginal bleeding and abdominal mass after transplantation, it may indicate the presence of ectopic pregnancy. It is recommended to consult a doctor in time, and under the doctor’s guidance, complete the relevant examinations to clarify whether it is an ectopic pregnancy.