Spiraling a bit about reoccurrence

Okay, so look.. I know the unknowns are not something we should dwell on. I had tnbc (BRCA1+, stage 3, grade 3, ki-67 was 90%), last year and did all the things (keynote 522 with Keytruda, double mastectomy, did not achieve pCR (rcb II), did Xeloda and now Lynparza. But I know there’s still a chance for things to return.

So my question is for those who *have had a reoccurrence*.. how did you notice things at first? Did it appear back in the same spot or distantly? I find it wild that routine scans aren’t really part of treatment maintenance if chances of reoccurrence are high and it’s just kind of a ‘wait and see’. But what exactly am I waiting for?