in your case in known case of strong family history , i should suggest you to undergo surgery (total abdominal hysterectomy
+ bilateral oophorectomy: removal of uterus along with tubes and ovary) as this protect you from development of future impending cancer of breast of yours. fundamental is estrogen
is reponsible for breast cancer
and this surgery causes permanent surgical menopause
. so if your family is complete (satisfactory number of issues) than get surgery done.