Infection after lumpectomy and sentinel node biopsy

hi all, I’m 51 years old and recently diagnosed with IDC. I had lumpectomy and sentinel node biopsy 3 weeks ago. First week was fine, 2nd week started to get shooting pains and a lot of discomfort particularly where they took out nodes. All normal and to be expected from what I read. My issue now is I think I may have an infection however apart from redness, swelling and itchy skin I don’t have a fever or discharge but it’s still very uncomfortable and painful. I saw my breast surgeon 3 days ago and have been told I need a 2nd op as didn’t get clear margins. Has put me on antibiotics as a precaution but didn’t think I had an infection but it seems to have gotten worse since I saw her. Maybe this is all part of the healing process but would love to hear of other women’s experiences! Good news is nothing showed in the 3 lymph nodes they took out so something positive for a change!