Hi Nessi,

Sorry to find you on here and feeling so worried about calcifications.  Did they tell you anything about how they had  classified them, for example indeterminate or suspicious?  Calcification often shows up on mammograms but they do tend to worry about them a bit more if they are clustered together in one area.  That being said they can also be benign but only a biopsy can confirm this.  It's absolutely awful waiting for results.  Three weeks seems quite long and I'd be on the phone after 2 weeks if I were you!  
I was in a similar position to you a year ago and was also very scared.  My calcifications (found in a routine mammogram) did turn out to be a low grade and very small invasive breast cancer with DCIS and I went on to have a mastectomy last March.   I didn't need chemotherapy or radiotherapy and just take Tamoxifen and I'm now getting back to normal again.  I'm 55.  Try to stay busy to distract yourself, this is the worst part not knowing.  If it is BC, it will have been caught very early and you'll be okay.  Remember, there is every chance it won't be so try to stay positive.

Best of luck,

Mary