Pelvic fluid in early pregnancy is not accompanied by lower abdominal pain and does not need to be treated as a normal phenomenon. There are two reasons for pelvic fluid: First, there is a small amount of fluid in the pelvic cavity itself, which plays a lubricating role, the amount is sometimes more and sometimes less, and is changed by the change of osmotic pressure in the body. Second, the pelvic fluid will increase after ovulation because when ovulation occurs, the egg is discharged from the surface of the ovary, the blood vessels on the surface of the ovary rupture, and blood flows to the pelvis to form pelvic fluid, but it will soon be absorbed on its own and does not need treatment. If pelvic fluid is accompanied by lower abdominal pain, gynecological examination should be performed. If there is pressure pain and rebound pain in the uterus and adnexa, pelvic inflammatory disease should be considered and antibiotic treatment should be given.