Recent diagnosis and concerned about timescales

I was/am in a similar situation. Everything (tests, results,action) has been at 2week intervals pretty much, including a CT scan. It was a grade 3 cancer but one sentinel node was affected so they have to take the lot out. They will count affected nodes then.  More than 3 it’s chaemo, less than 3 it’s the Oncatype test and a decision based on that. With a Grade 3 cancer, I am resigning myself to chaemo either way but it’s still possible there won’t be any spread there at all. I dont know how reliable the Ultrasound can be compared to lab view.  
It would be reassuring for you to have a date for the op, at least. Can you ask the Macmillan nurse what the av wait is between biopsy result and lumpectomy?  I was given the date when the biopsy results were given to me.
However, I dont feel my own waits will have affected outcomes and treatment types very much, if at all. Not compared to the delay in spotting the thing to start with!
It is a shock but you are not alone. A bit of space to let it sink in, to tell people and get your head round it all isn’t necessarily a bad thing. Good luck.