Breast cancer grade 2

I am 2 weeks in to getting the news, I am in total shock, I’m 41, the plan is to have around 18 weeks of chemo to shrink, lump is around 5cm, then surgery then radiotherapy, they said it doesn’t look like in my lymph nodes (doesn’t look like?) surely they need to test them before they operate in around 22 weeks, I had a ct scan yesterday, if they are in lymph nodes will it show on that? So many people seem to of had a biopsy from there nodes? I’m in bits, can slowly feel depression setting in, I’m usually such a positive person but I’m terrified...