@Makday fingers crossed for you, but I think it is wise to acknowledge that recommendations for treatment may change. I've had two experiences where the surgeons opinion was very different from the oncologists.
If that does happen, there are tests available to help determine how useful chemo might be. Sometimes the percentages for a better ten year outcome can be tiny, as Millie pointed out, so those can be tough decisions to make. Hopefully you won't find yourself in that situation.
What a pity you aren't getting much value out of your breast care nurse. The quality of that service seems to vary widely, perhaps that's down to workloads or the personality of the staff. The two BCN here have been around for over a decade and they are absolutely fantastic, which has been a huge help over the years.