"Choosing" chemo?

I put "choosing" in quotes, because at the end of the day we should all be making our own choices in our treatment plans.

But just yesterday I met with my new oncologist and decided to proceed with a course of chemo (TC x4) when it might only give a small benefit or even no benefit at all :(. This is my 3rd diagnosis of "favorable" breast cancer, and I'm so over it :(. First diagnosis 7 years ago age 35, first local recurrence 4 years ago, and now second local recurrence found December/January. All along it's been ++-, the "best kind," low risk etc etc. We hit it with aggressive surgery and radiation from the get-go, and I've been on endocrine therapies all along but never chemo. This time the recurrence has an oncotype of 21, and I'm still under 50, so it's the gray area of maybe a small benefit. There are of course tons of other factors that I have discussed at length with my docs, but I was ultimately just given a choice and told that either option is perfectly reasonable. I decided to go ahead with it, and I'm scheduled to get a port in 3 weeks. I guess I'm feeling a little scared about opting for a serious treatment when I might not need it. However I have trust issues with the treatments I've already tried, so psychologically I feel I can't put aside another tool that might help. And if it comes back in my bones or liver or anywhere else, it would be hard to accept that I didn't do everything available. Ugh, but my cancer cells might be "sleepy" enough that they'll just ignore the chemo. I hate all of this :(

Has anyone here opted to do chemo when it wasn't deemed essential or 100% a benefit? If so, I would appreciate any sharing of your experiences.