@"Prime time" Sorry to hear that - it's hard to hear. I went in for a partial for a 2.5cm ILC tumour and no suspicious nodes - biopsy came back with 4.5cm, no clear margins and 3 positive nodes so back for mastectomy and further 5 nodes removed. This also meant that chemo was recommended (4AC & 12 Paclitaxol) which I'm still doing, then rads and hormone therapy as I am OR & PR +. What your path will be will depend on your path report and you will find out more when you see your oncologist.
As far as advice - all of the above. Look after yourself and don't expect to be on top of things. I found that taking someone with me to appointments (my husband) was useful as I would often forget things. I also jot questions down as I think of them so that I have a list (lucky docs) when I go in. The other thing I found useful is a zipup 2 ring binder from Officeworks and a heap of clear sleeves and some dividers (the zip means that I can tuck things in there and they don't fall out. Every document I get goes in that folder and I take it with me to every appointment - that way I always have everything at my fingertips. (I originally bought an ordinary size binder and fairly quickly had to replace it with a lever-arch type).
Take care and keep in touch with your results.