I am 42, premenopausal, and have been on tamoxifen for 6 months as a breast cancer preventative (strong family history of breast cancer and I was recently diagnosed with atypical hyperplasia in breast). I began having abnormal bleeding a few months ago. A endometrial biopsy revealed "simple overgrowth". My gynecologist wants me to take Provera for 6 months. Is Provera safe for me to take with my breast cancer risk already high?