Hi Caroline,
Very glad they got clear margins for you. You have a similar profile as me. 3cm, Grade 3, Stage 2b. There the similarity ends. Mine was Ductal invasive tumour , 100% ER positive, 70% PR positive, HER2 negative. 1 out of 3 nodes affected, vascular invasion. As you are HER 2 positive, you would have had to have chemo anyway. But the Herceptin you will have with it is an additional treatment to get rid of cancer, as is Tamoxifen and rads. You will be throwing everything available at the thing, so oddly, it's good news really!! Although I doubt you will see it that way. Sending Very big hugs, and best wishes for your treatment. It will be a long haul - but worth it to kill the b*****d!!
PG xx