I had this as well, It meant as nodes were clear I could have an immediate implant without the worry of the effect rads would have
Had mastex about 3 weeks later and was virtually healed
Do rememebr to do the exercises though.
I had a stand alone SNB approximately 3 weeks before my mastectomy. I had little pain after the biopsy not sure how long you will have to wait. The good (if you can say good) is the soreness will all be on the one side
Hope this helps