Hi Yango. Some excellent advice above. Right now you could and should be told a size and a grade (the level of activity of the cancer cells, 1 is slow growing, 3 is fast growing). This tends not to change but the size does. Mine doubled on size once they'd removed it and examined it. Ask your GP for a copy of your biopsy report. You are entitled to it.
Someone above referred to some scans as being standard. In my experience that's not so. I had zero scans. It often seems to be at the discretion of your doctors. It also depends on your age, the size of your tumour, and whether it's spread to your lymph nodes. Some people find lumps in their armpits to start with so go straight to MRIs.
Rest assured that nothing bad will happen while you wait. While every fibre of your being is screaming get this thing out of me, there's no issue with a wait of a few weeks. Sometimes it can even help with the adjustment and processing of the news.
If the wait does get too much, as many have said above, ask your GP to refer you to a private breast surgeon. My surgeon charged a gap of $500.
Take some deep breaths, they help calm the nervous system, and hang in there. Once a treatment plan forms you will feel better. Big hug, K