@Oblomov23 You can appreciate I don't want to put all my medical details online but I was on the cusp of osteoporosis (hips) even though I was not post menopause.
Bone is living tissue like skin. It's entirely possible to build bone. Bone density loss starts when the old bone is lost at a faster rate than new bone is laid down. This happens post menopause when the bone loss can be 5% a year for a few years.
Estrogen plays a major part in building new bone (it's a complicated process but that's the basis of it) so supplementing it (HRT) has been shown to improve bone density. There are loads of scientific papers showing the percentage of improvement with time/over years.
Drugs like bisphosphonates cement the dead bone in place and stop it being lost. But they don't create new living bone. That's why there is some risk of micro fractures in time, because dead bone still breaks even though it's 'dense'.
It's another reason why younger women should consider HRT as a treatment. Along with enough calcium and the right exercises, it is possible to build new bone. Diet is also important as a more alkaline diet with loads of fruit and veg is thought to help. Fizzy drinks that contain phosphoric acid are bad for bones and of course, smoking.
The Royal Osteoporosis Society has loads of info on this.
There are books and online videos of the right exercises to do for each part of the body (mainly hips and spines), using dumb bells or ankle weights. This is what I've done as well as walking (quite energetically, up hills.)
I'm sure you will get some improvement but also check you are on the right dose of HRT to make a difference. Are you having a scan every 2 to 3 years? And is your HRT being monitored to see how it's working?
Hope this helps.