I had same pathology but node clear. Staging is based on size and numbet of nodes. I had a very fast growing tumour that I was very fortunate to have found 5 weeks after a clear mammogram. I am 2 years from survery now.
My niece had 2 tumours so small they were less than 2mm each...but had 10 positive nodes out of 20. 14 years on she is cancer free. She was on the herceptin trials.
We all worry it's not gone...it's hiding. It gets better over time . Any worries speak to a Dr early though as worrying what might be sucks the joy out of life.
Congratulations on completing your chemo and surgery. It's a huge challenge to get through. Kath x