See what your surgeon says. It would be good if a mastectomy guaranteed no more cancer but it can’t really. A bit less to worry about but not sure fire end to the problem. I had a mastectomy, no regrets and no reconstruction, but my other choice was a partial mastectomy not a lumpectomy. Worth asking your surgeon’s opinion on clear margins and also about recon options if, for any reason, you don’t do it immediately. Good to have all your choices clear in your head as ultimately it’s a personal decision. Best wishes whichever option you choose.