Hi there, I was raised in Orange County, 3rd generation and have great memories of all the great things and people who reside there.
I can only tell you what I went through, so please take it with a grain of salt. I'm coming from a place where there are women here whose onc's did not specialize in Tneg and did not understand first hand just how aggressive the tumors can be. It is more proactive not to assume anything.
So in that regard, after hearing your experience with chemo and the results that came out of the surgery I'd be inclined to follow my onc's prescription which was to do a CT a month after I had finished radiation; then a 2nd scan in 6 months. After that he waited a year then I was done with scans. Needless to say he watched me like a hawk and, as an aside, I didn't have any problems getting the insurance company to sign off.
Best of luck to you and since I'm writing this from chilly WA state, I can say I miss the warm Fall in CA. Best, Mainy