Decision - Breast conserving lumpectomy OR Mastectomy with Immediate DIEP. Any words of wisdom?

Hello there, I’m following posts on surgery too. I have been recently diagnosed (with TNBC) and am currently undergoing chemo.  Chemo is reducing size of lump (yay) and my Breast Surgeon has advised lumpectomy & lymph node clearance followed by radiation.  

However, I’m awaiting results of genetic testing and research is showing I’m at high risk for reoccurrence or to other breast / ovaries if I am BRCA positive. So, if that’s the case, I’ve already decided that I’ll go double mastectomy (& ovaries).  :(