Any of you who have dealt with Ovarian Cancer or cysts at a young age (29)?

I had an MRI for a car wreck and it revealed I had a 8 cm mass in my pelvis... I had an ultrasound, and the tech said that the mass looked like a large cyst, fluid filled and cystadneocarcinoma cannot be ruled out. Cyst may be malignant due to size. The tech also mentioned blood flow to it, which I know is bad... I am 29, have a child and have no history in the family of cancer, but that report has me terrified. I am having surgery to remove it next month, but I just fear it is cancer. I know they won't know until they take it out, but is the fact that is is fluid filled good or bad? Any experience with ovarian cysts?