Endos do not do biopsies - they treat the thyroid with meds. Surgeons (ENTs) do the biopsies.
Let us know what the results are with the biopsy.
For the past 3 or so years my ENDO has order for me to have an ultra sound and biopsy ever 6 months. My ENDO was the one that performed the ultra sound guilded biopsy. I resently had a complete Thyroidectomy because my nodule was getting larger, although my biopies have always been benign. My Thyroidectomy was performed by an ENT surgeon.