A couple of things to remember, GYN/Oncologists treat many benign conditions, they are experts with 3 years additional training, also, they do not spend a big chunk of their time on obstetrics.
Ovarian Cancer is a very rare disease. Most
ovarian cysts are benign.
Ovarian cancer can only be diagnosed through a biopsy.
The best thing to do is try to relax, and wait for the answers before panicing or even before researching....