Worried

I have Stage IV breast cancer for 20 months and had one lymph node removed , chemo, and am now on herceptin arimidex pamidronate and lupron depot. On a whim, my obgyn ordered a routine mammogram and now she called me up saying that the radiologist claims there is progression of cancer in my breast due to increased microcalcifications since my Nov.2006mammogram before my lymph node surgery. My oncologist is out of town and I will see him on Oct 2. Should I be as upset as I am? Are microcalcifications bad at this stage of the game ? What now? Has anyone had this occur?