What does your doctor say is the next step? The Doctor might want to be cautious which is good.
Alex
I am sorry to hear you had breast cancer and now have an ovarian cyst. Most ovarian cysts are benign (non-cancerous) regardless of the woman's age. However, I believe the risk of ovarian cancer increases after menopause. But even still, a woman without a family history of OC or a genetic link has a VERY LOW lifetime risk (less than 2%).
There are many women who get breast cancer that is not hereditary. But women without a hereditary risk of ovarian cancer rarely get it.