Follow up biopsies needed?

I attended a routine mammogram at the age of 53 around a month ago. The results suggests that I need to attend the breast clinic for further tests. Attending last week and had further mammograms, ultrasound and 2 biopsies taken, with the use of ultrasound for correct location. I have now been told that the biopsies are normal but that the result is non-concordent? I need to attend for further biopsies, with clips and mammogram to confirm samples taken from the correct place. I'm worried sick. Any experience of this or advice please?