I was the same as you - last year: regular mammogram, found a lump (tears), biopsy followed. Phone call from the hospital to come in 3 days hence (tears again). Consultant gave me the news - but.....
The mammogram found the lump early, yes it was cancerous, but it was small.
I had to tell my children - they live in the UK - I live in France. I think that was the worst part, but my daughter was a star, she organised for herself and my son to come while I had my op (they 'worked from home ' my home ) cleaned the house and prepped meals for the freezer.
The op (3 weeks after seeing the consultant ) was to take out the lump and lymph nodes to check if it had spread.
It hadn't, and 6 weeks later I had a course of radiotherapy and now I am on one tablet a day for 5 years - we call them my bitch pills (the only my side effect is to make me bad-tempered) - but that just may be my natural personality.
Sorry if that was long-winded - I hope that the biopsy for you is negative, but if not, the system is there for quick treatment, and they do all know what they are doing.
Like others I would advise not to Google, it's worrying enough - I did and it only made me worry more.
I'm a year on and try not to think of last year too much, and to be honest, the worry of it returning does sometimes get to me, and other times when asked how I am, I don't even realise that the person is talking about my cancer.
My daughter keeps telling everyone she knows to have a mammogram, using me as her case study.