In ectopic pregnancy, the uterus may be slightly enlarged in proportion to the number of weeks of gestation, i.e. the uterus may be slightly enlarged, but with a difference in size compared to the uterus at the corresponding number of days of gestation. Ectopic pregnancy, also known as ectopic pregnancy, occurs when the fertilized egg formed after the union of sperm and egg fails to migrate into the uterine cavity and lays outside the uterus, such as in the fallopian tubes. After a patient becomes pregnant, whether it is a normal uterine pregnancy or an ectopic pregnancy, there will be increased levels of estrogen and progesterone, and other endocrine hormones will also change. The increased levels of these hormones will stimulate the myometrium to proliferate, become engorged and edematous, so the patient’s uterus will be slightly enlarged compared to a normal uterus. However, since the gestational sac does not grow inside the uterine cavity, but outside it, the uterus will not increase in size with the gestational sac and will be smaller than the normal pregnancy month. If the ultrasound examination shows that the gestational sac is not visible in the uterine cavity, an abnormal mass is found outside the uterus, or the chorionic gonadotropin is elevated, you should be alert to ectopic pregnancy. Prompt surgical treatment is recommended to avoid serious consequences such as rupture of the gestational sac leading to hemorrhage and uterine cavity infection.