If there is lower abdominal pain in early pregnancy, there are several possibilities: 1) normal, due to the enlargement of the uterus, as well as the pulling reaction, which generally does not require special treatment, mostly seen in primiparous women; 2) slight abdominal pain during the process of embryo implantation; 3) pathological, need to consider whether there is a pre-miscarriage, and also to exclude ectopic pregnancy. Therefore, for pregnant women who have lower abdominal pain in early pregnancy, it is recommended to do ultrasound examination. Ultrasound can understand the location of the gestational sac, and if it is an intrauterine pregnancy, you can rest well, and if it is an ectopic pregnancy, it is best to be hospitalized.