Level 1: Causes and manifestations of abdominal pain in early pregnancy: In early pregnancy, mild abdominal pain will occur due to the thickening of the endometrium and the implantation of the fetus. However, if the abdominal pain is too severe, accompanied by vaginal bleeding, fever, etc., it may be caused by ectopic pregnancy or other complications. In addition, other symptoms such as nausea and vomiting may occur in early pregnancy. Level 2: How to relieve abdominal pain in early pregnancy. When you have mild abdominal pain in early pregnancy, you can take the following measures to relieve it: