Does lumpectomy equal no new implants?

Hello,

I have 2 existing implants and now have a cancerous tumor right next to the left one, and up against my chest wall. My BS said I need to go smaller because I am too little and don’t have enough skin once she cuts out the tumor and surrounding tissue. If that is true, then what happens to my right breast that is fine? I don’t want one big breast and one small one.

My PS said they can do whatever I want...but getting both implants to be swapped out (regardless of size) always seems to point to a double MX. Is this true?

Thanks