total hysterectomy and found a tiny breast lump

Hello
i am 33 and a single mother of one son. Two years ago, I had to have a total hysterectomy. Currently after experiencing pain in my shoulder, collar bone and breast, I went to the Dr. She found a lump. I will have my mammogram in two days. I have tried not to over react. However, she focused on the cancer aspect more than any positive. She told me of lumpectomy, mastectomy, radiation, and the specialist that I could have to choose from. Is there anyway, she could already know what is going on by just her examination?