Hi. I'm sorry to hear about your ultrasound results. To answer your question, no, they can not tell if you have cancer from your ultrasound. They will have to do a fine needle aspiration (biopsy) to find out if there is cancer present. Sometimes they can't even tell from the biopsy, as was the case with me. My biopsy came back "suspicious" so my endocrinologist recommended I have my thyroid removed. After my Total thyroidectomy they sent my thyroid off to the lab and it came back with a small cancer on it.
What you can expect from your first visit to a specialist is a complete physical. He/She will probably ask you lots of questions about your past. Where you have lived? where you were born? etc.
Hope this helps. Remember you are not alone. Pam