I had to go back for a second op as clear margins were not achieved the first time and yes second time round the news was harder to take but all was good and clear margins were gained. From reading I've done on other forums there have been other people who have gone back more than twice but i imagine that surgeons would not want to do that unless it was absolutely necessary. Mine was grade 2, stage 1, no lymph node involvement. Ask your med team about the EXPERT trial and whether you would be a good candidate for it. It's a 10 year trial looking at whether early stage BC needs radiation or not. I got into the non-radiation group which means i just have to take the anti hormone drug (letrozole). Often the medical cohort don't know if they got it all till the results are back from pathology and they like to have a clear 2mm margin that has no cancerous or pre-cancerous cells present. Good luck with your results.
Cath xx