After surgery

Hi I know this may sound like a strange question but feel a little confused. I had a lumpectomy and sentinel node biopsy just under a month ago, have been referred to an oncologist for radiotherapy and have just started letrozole. I know the path I am taking is to treat cancer but as the cancer has been removed am I now cancer free. It just feels like I don't know where I fit if that makes sense, prior to surgery I had the cloud of having breast cancer but now I don't know if that's gone yet. I don't know if anyone has ever felt like this or whether I am overthinking things with too much time on my hands recuperating xx