Awaiting biopsy results but told I've got Breast cancer

I found a lump two wks ago. 

Within the two week period like my gp said I was seen by the breast clinic. 

Had a ultra sound scan, lump is 3cm.

Had a Mamogram same day, confirmed lump was worrying and looked like cancer. 

Had a core biopsy same day, x3 took. 

Told I was 5/5 likely to have BC and to come back in a wk for biopsy results and treatment plan.

Macmillian nurse was there for last consultation, breast care specialist. 

Am I in denial thinking my biopsy could come back not cancer?

They are saying the biopsy will confirm their diagnosis and get a treatment plan sorted. 

Anyone had anything similar to me?