Ectopic pregnancy is not a normal state of pregnancy. Normally, the gestational sac should be located in the middle of the uterine cavity. An ectopic pregnancy refers to the implantation of the gestational sac outside the uterine cavity. Common types of ectopic pregnancy include tubal pregnancy, ovarian pregnancy, and abdominal pregnancy, with over 99% of ectopic pregnancies being tubal pregnancies. The symptoms of an ectopic pregnancy include the following aspects: 1. In the early stages of an ectopic pregnancy, there are no clinical symptoms because the early gestational sac is relatively small and does not stimulate the fallopian tube or the local area, thus causing no symptoms. 2. When the gestational sac grows to a certain size, it compresses the tube cavity, causing mild abdominal pain. This pain intensifies as the gestational sac grows and can lead to tearing pain, indicating a ruptured tubal pregnancy. 3. During an ectopic pregnancy, because the gestational sac cannot develop normally, the levels of estrogen and progesterone in the body are relatively low, leading to endometrial withdrawal bleeding, which manifests as a small amount of bright red vaginal bleeding.