@hollygs not to intrude but I was wondering a few things after reading your post and it would help me since NTX is another way to test for anti-resorption.

Was that a urine NTX? Maybe it's something else because yours look like it is in the normal reference range.? What test did you have? What was the reference range?
https://emedicine.medscape.com/article/2093977-overview
Apparently it fluctuates and is not as reliable as the serum CTX https://en.wikipedia.org/wiki/N-terminal_telopeptide

I have read and experienced that Tymlos raises both P1NP and CTX so it would probably raise NTX, if that is what you had.