What Are The Chances Of Malignancy In Case Of Breast Lump?

Hi, may I answer your health queries right now ? Please type your query here...I'm 39. No history of Breast Cancer in family. Had a routine mammo and ultrasound because of implants. Nothing on mammo, ultrasound showed a 7mm mass. Going for biopsy tomorrow and very anxious. I insisted on the U/S because I couldn't wait the 3 months that they recommended for a re-check by U/S.I'm not sure what my question is...maybe just wondering what the chances are of this being cancer. I'm a very active, busy mother of three and I can't seem to shake my anxiety!!