Most ovarian cysts and masses are benign, even suspicious looking ones. If you do not have a family history or predisposition for ovarian cancer then your lifetime risk is less than 2%.
And yes, the CA125 test is not accurate at diagnosing ovarian cancer. Benign (non-cancerous) conditions can cause an elevated result. A friend of mine had a CA125 level over 1000 (VERY HIGH) when she had a benign cyst. She unnecessarily lost not only her ovary but also her uterus and other ovary. Her surgeon should have removed just the cyst.
Unfortunately, I have a similar story of unnecessary sex organ removal. MOST hysterectomies and oophorectomies (ovary removals) are done unnecessarily.
How high was your Ca125? Sometimes a Ca125 can be elevated for other reasons than cancer.
Alex