With a spine score of -3.5 I hope you can do Tymlos, which is good for the spine (I had a 20% gain) or Evenity. The longer you do an anti-resorptive like alendronate, the more the effectiveness of bone builders like Tymlos and Evenity is affected negatively. The problem is that insurance likes the cheaper drugs first, so your doctor will have to authorize a bone builder.

After a bone builder you can do Reclast or alendronate to "lock in" gains.

So no, with your score, a 3% gain is probably not enough. Ask your doctor! (I hope you have an endocrinologist who treats a lot of osteoporosis.)