Lump treatment

Hi, new member still processing outcome of yestersay  :( . 

I found a a 3cm lump above my breast 2 weeks ago. Almost on chest area. Went to breaat clinic today. Initial thoughts was cyst as it does move under the skin; however after mammogram and ultrasound, as well as biopsy I have been told by the specialist the likelihood is cancer based on the outline of the lump.

It all feels a bit of a blur what was said after that and I was in there alone. She mentioned an MRI as breast tissue is dense. She also said the ultrasound didn't find anything in the lymphnodes under the armpit. 

My results from biopsy will be three weeks. It seems an incredibly long time to wait to see what my treatment will be. If anyone has had simular what was your treatment plan? They have already mentioned removing the lump. Can it spread in these timescales? 

Thank you for reading. I have not told anyone apart from husband.  Breaks my heart having to tell my children x