Hi @KimF, I am sorry you find yourself in this situation. It is so overwhelming at the start and so hard emotionally. This is a great supportive community so it's good you have written in.
I had ER and PR positive and Her2 negative, aggressive cells, grade 3 and high chance of return but caught early. I had discussions with my surgeon and he was very confident a lumpectomy was the way forward. That was 2020. I went with his advice and I am so very pleased I did. I had surgery, chemo and radium and now take AIs.
The decision is entirely up to you. We are all different but I think for me, recovering has been great. I had my breast reshaped with my lumpectomy as I was very big breasted. I reduced my non cancer breast to match the other one so my breasts look pretty good although scars which I am proud of really.
For me while there is alot to deal with emotionally processing breast cancer having breasts still has been a good thing too I do get scan anxiety every year but I think I would get that anyway regardless for all the check ups.
I am sure there will be some information on the bcna website about decision making but my advice would be to trust your medical team and their recommendations.