Try not to panic, easier said than done.
I'm sure that we have similar journeys, but there are always differences.
I expect that you will need a biopsy, and that will most likely be done by the Surgeon.
He or she make a plan for you re appropriate treatment.
Not everyone has Chemo. And not everyone has surgery before Chemo, some have Chemo first.
It really depends on the biopsy result.
For me I had my biopsies done at the U/S place. They must have seen something highly suspicious. I don't know how often they do biopsies , but I consented.
They did a core biopsy on the breast and a fine needle biopsy under my arm. In hindsight they must have seen something there, as I did have a positive Lymph node.
It was my Breast Surgeon that gave me my results. In my case a Mastectomy with Axillary clearance was the recommendation. Next visit to the Surgeon gave me the Histopathology ie more detailed information about the cancer size and clearance. In my case I was then referred to an Oncologist. It was him that chose my Chemo and made a referral to R/T. My Surgeon also put in a Infusaport, before Chemo started. My Surgeon and Onc communicated well with each other. This was in the Private system and in South Australia.
You may not need all of this treatment. You may not need anything if the biopsy isn't cancer.
You really need to take one step at a time. It is normal to be anxious.
Good luck with the Surgeon and results.