Gone sideways :( Initially given good news when treatment ended but MDT have decided otherwise. Has this happened to anyone else?

Gone sideways. Initially told based on end of treatment scan and previous results that A(B)VD had gone "exceptionally" well and t re is only a "tiny spot" on my chest they want to treat with radiotherapy. MDT have decided otherwise and now have to have a biopsy to investigate. Spoke to CNS and need to see Consultant next week who will explain possible treatment. When I pushed implication as this could be further chemo . Not happy as you can imagine, has anyone had a similar experience?