I understand your anxiety, the not knowing is scary. I am glad your provider has decided to check out so you know for sure.

This article by American Cancer Society has explanations of different types of biopsy including Stereotactic.
https://www.cancer.org/cancer/breast-cancer/screening-tests-and-early-detection/breast-biopsy/core-needle-biopsy-of-the-breast.html
I hope they get you biopsy scheduled soon and everything is negative.

Laurie