@kmaree
I had my mastectomy three days after my biopsy results. Quick it was, but a good thing. You can always decide about your other breast at a later date, when you know how you have recovered. Your decision about reconstruction will be a significant factor too. A lot depends on the details of your diagnosis and how likely or unlikely cancer in your other breast is. For me, there was no indication that I was more likely to get cancer again in my remaining breast than in another part of my body. Nine years later, that position still stands. Best wishes whatever you decide.