I knew I had 8 or 9 suss looking ( very enlarged) lymph nodes through an ultrasound - the biopsied one was malignant, so 17 went when I had my mastectomy. As it turned out, the biopsied one was the only malignant one, but I still think it was a reasonable call to take more, on the evidence to hand. But it’s reasonable to ask why lymph nodes will be removed if there is no evidence of any cancer spread? Loss of a significant number of lymph nodes places you at risk of lymphoedema. Not the end of the world (mine is manageable and causes few problems) but no-one needs it without a good reason. Best wishes.