Welcome to the group, I'm sure you would rather not participate, however it is what it is and you will get loads of support from the Group.
I was diagnosed with TNBC in November 2013 and finished chemo in April this year. I opted for a mastectomy and have just had the other breast removed two weeks ago with expanders (ready for implants).
The onset this journey is very daunting, but it is doable, the only way through it, is through it, you will come out the other end forever changed.
Try to drink lots of water during your treatment and stay away from Google, the research on line is dated and our prognosis is far more positive these days.
Stay strong and if you need vent on this forum, we've all been there and may be able to help.