definately not an expert...but found a small lump on my right nipple..I figured it was sore because I kept touching it to see if it was gone.  I never missed a mammography and the last two years they suggested sonograms to ease concerns.  After 6 months of check ups and sonograms every 3 months; my surgeon decided to remove it - family history of fybroid cysts...so wasn't taken too seriously. Except I have a friend Kathryn now in 4th stage cancrl for 3 years - been to Baylor, MD Anderson in Houston, so many clinical trials. etc.  She begged me to just have it removed. 

First biopsy showed cancer...second was lymph nodes check - one of five had cancer so next surgery was bilateral mastectemy - 11cm x 4 cm cancer mass. 

I'm fortunate that they think they got it all...but don't wait..

The first lumpectemy was barley visible on the outside....but more importantly we found what was growing inside - undedected by sonograms and mammograms.  Don't wait....we know our bodies better than any technology out there.  Make an appt with one of the best know breast surgeons in your area...