Hello. The diagnosis of breast cancer
if primarily by accuarte clinical exammination, FNAC coupled with mamography if required. In your case, because your results have been indecisive, you must go in for a trucut biopsy
which would help reach an accurate diagnosis probably. A variety of special tests called as IHC can be done on tissue pre-operatively to confirm that you have/ have not breast cancer. Surgical oncologists are the people who can guide you further on this. Also please do not unnecessarily delay diagnosis. Take care.