Hello I'm 25yrs old Female..I recently went for a pelvic and trans-vaginal ultrasound do to shortened period and bloating,cramping..My ultrasound report came back moderate free fluid in the Cul-De-Sac and left adnexal.No mass ,no cysts,ovary's are not enlarged there normal size no pregnancy,everything looks fine..What can cause moderate free fluid in those locations if everything is fine?