Oh Mel, that just sucks, I'm so sorry. My tumour doubled in size too. It was measured at one size in the mammogram but turned out to be twice that once it was excised. It's quite common for this to occur. I had to go back for margins, and the re-excision turned up 4cm of previously unseen DCIS.
I know it's hard, there's just no way it couldn't be, but clarity is slowly emerging and then there'll be a plan. Breathe, try not to cross bridges until you come to them, and look no further ahead than an hour or two. Have you got good company around you for the weekend? Keep yourself distracted as best you can. We're here for you. Kate xox