text: what does it mean to have fluid in the uterus is that bad? i recently had a pelvic ultrasound and the doctor told me i have fluid in my uterus. i experience pelvic pains constantly. i was wondering how does the fluid get in your uterus and if it is bad. the doctors didnt really say much "a certain amount of free fluid in the pelvis, behind the uterus, is normal at certain points in your cycle; after ovulation, a small amount of fluid released with the egg collects behind the uterus and is eventually reabsorbed by the body. a larger amount of fluid may indicate a ruptured ovarian cyst. pain is usually present in this instance, but most often resolves on its own within a few days. infection is another possibility, but in this case symptoms such as pain and fever are often significant."  perhaps you should get a second opinion.