There are other supplements that can be taken to help with bone building. And my doctor has recommended the following: I've been taking from Ancestral Supplements 2 supplements - Bone and Marrow and Living Bone, AlgaeCal (without strontium) ordered from algaecal.com, in addition to Boron, K2-7 + D3, Ultra K4. I use ankle weights for some of my weight bearing exercises since I am petite. There are an also sports/exercises that are weight bearing - brisk walking, jogging (doesn't have to be fast, start slow and build up) tennis, dancing, jumping jacks. You needn't be an athlete to do any of these activities.
My last scan taken a year after my last one showed no progression which is good. I will retest again this year to see if I have remained stable or decreased my levels.
There is also a woman I follow, Margaret Martin, physical therapist and osteoporosis expert (MelioGuide Osteoporosis Exercise Program.) She is definitely worth looking up to get you started if you do not have a current exercise program specific to osteoporosis.
Best to you!