Back to surgeon - found a lump

I had lumpectomy in May, stage 1, radiotherapy in August. Today I have found a small lump above my breast but below my collar bone, I rang the breast care nurses and explained what I had found and they straight away booked me in to see my surgeon on Thursday. I honestly thought they'd say it's probably a fatty lump.

Please don't let this be it coming back, I'm quite scared.