Hi @imogen
Welcome to the forum.
You are definitely not the only person who thinks the waiting is the worst. I’m 6 months post chemo and radiotherapy, surgery 1 year. I was told that breast cancer generally grows quite slowly so a few weeks or months is not a problem. I found a lump in April but didn’t have surgery until July as they found a second tumour in the other breast when having a MRI to size the original tumour. So that was 3 months from lump to first treatment. It was horrible but was assured they wanted to get it right first time so getting the test and results in place was paramount.
For anyone else that HER2+ there is a group called HER2 buddies you might like to join