They do usually grade it at the time of biopsy but that is only an indication and can change when you have surgery… Eg they can biopsy a bit that is grade 2 but when they look at the whole tumour there might be a small bit of grade 3 so that would give it a final grade 3 even if it was a tiny dot compared to the grade 2.
The stage is also worked out after surgery as that is based on the size and spread of the cancer… Stage 1 is a small tumour confined to the breast, stage two may have spread to the lymph nodes or be medium sized and stage three may have spread to nodes further from the tumour or be a large size… Stage 4 is when it has spread to another part of your body and is sometimes called advanced breast cancer or metastasis or secondaries.
However TNBC is pretty much always grade 3… I think horace is the only TNBC lady i know of with a grade 2 and havent come across anybody with a grade 1, so even if you dont know its quite likely it would be a grade 3… As you have positive lymph nodes you would be at least stage 2. Stages 1-3 are still cureable… So thats really what the aim is… To cure you!
Best of luck xx