MD, good on you for insisting. When my breast lump (pre-cancerous) was picked up by mammogram, it was after my thorough GP referred me "just in case" despite feeling fairly certain nothing was wrong. Thank goodness he did. The clinic called it a "great pick up".

I am sure your lumps are nothing to worry about, but with my history I think everyone should have every suspicious change checked just to be sure. A few hours for an u/s or mammogram is a very small price to pay. Best of luck with it. You're in my thoughts.