What Does Trace Of Fluid In Vaginal Ultrasound Indicate?

I was diagnosed with breast cancer in April at age 32 after finding a lump during my monthly self exam. I ended up testing positive for the BRCA genetic mutation even though not a single family member on either side has had breast or ovarian cancer. I just completed my chemo so my oncologist thought it was time to check the ovaries. I went in for a vaginal ultrasound today and the radiologist's report states that my ovaries have normal appearance and flow (yay!). However, it also states "trace free fluid". I've been looking online,and I know I shouldn't, and found that free fluid is a sign of ovarian cancer. My oncologist's nurse called and said everything looks fine. Mind you, i havent had a period due to chemo for 4 months so the fluid cannot be related to a regular menstrual cycle. What I would like to know is, is there any risk of ovarian cancer with the fluid? Why is the fluid there- what else could it be? I'm not sure if I have had abdominal pain; I'm not really sure how bad pain really feels anymore after chemo; I'm kind of numb to it, as I'm sure a lot of chemo patients become. So, as far as I know, no other major symptoms that cannot be attributed to chemo side affects. Any help is much appreciated.