Suggest Remedy For Fibroadenoma Of Breast

Hi I have several fibroadenoma in both breasts all under 1cm and I had a larger growing lump taken out over 4 years ago. I have been given a progesterone only pill. Is there a possibility that this could cause my lumps to grow larger as they have remained the same size for some time now. Also is there anything I can do differently to prevent the lumps growing in future. For example I was told that cutting out caffiene could help my body control hormone levels?