For normative data of TBS values we used the cutoff points recommended in the literature (12): TBS >1.350 is normal; TBS between 1.200 and 1.350 is indicative of partially degraded microarchitecture; and TBS< 1.200 equals degraded microarchitecture.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6516507/
@sunshine07 So the microarchitecture of your bones is "partially degraded." The question is why. Do you have hormonal issues? Has your parathyroid been tested? Kidneys? Do you take steroids? Etc.

As for fertility:
https://www.drugs.com/tips/forteo-patient-tips#:~:text=1.%20Forteo%20is%20injected
There are no controlled studies in pregnant women to determine the harms of taking Forteo during pregnancy but animal studies have shown increased skeletal deviations and variations at 6 times the human dose. Avoid during pregnancy. Encourage women of childbearing potential to use an effective contraceptive during treatment with Forteo

So it isn't that Forteo or Tymlos (I am not researching Evenity but probably the same) affect fertilitiy. It's that you cannot have a surprise pregnancy because they will affect a fetus. This is true of many drugs. Doctors are reluctant to prescribe for child bearing years. If you are on reliable birth control the MD might prescribe it.