Triple Neg HER2 what questions

Hello every-one, I have recently been diagnosed with TN BC.  I am 56 years young and live in Brisbane.  The tumour was detected on routine mammogram screening a couple of weeks ago. I had the lump removed (round wide excision) on February 13.  Since then I have had 3 aspirations for recurring seromas and yesterday the Surgeon decided to put a drain in.  So I now have a very boring plastic handbag attached to enough tubing to plumb a house coming from the catheter in my right breast.  I am fortunate that the tumour was small but it was a very aggressive grade 3 invasive carcinoma.  i saw an Oncologist last week and we have a decision to make that I am struggling with.  As the tumour was small I can just have radiotherapy and play the numbers game that it doesn't recur.  As it is TN and aggressive I have also been offered chemotherapy followed by radiotherapy.  This will reduce the chances of recurrence but as we all know, it may still recur. Whilst, I want to do everything I possibly can to reduce the chance of that happening, I am battling with the consequences of chemotherapy particularly on my immune system.  I am not the most robust person. Interestingly, I asked my Surgeon about a PET scan and he said "well if you want to..."  the Oncologist said she wouldn't recommend it at this time. I would be interested in hearing your comments regarding the side effects of chemotherapy. Thank you, and I am glad I found this forum.