Hi Sjays...welcome..
The only thing to be concerned about is the balance between the oestrogen and the prog, as it may not be enough to give protection...I don't know much about Provera, but hopefully someone else will know more, but what I'd do is increase slowly, as another full sachet might be too much, as I remember, Sandrena gel is quite strong. I actually loved it...but I've settled on Femoston Conti now....if the two sachets aren't enough, just use a tiny bit first of the third one, then work up after a while if you still feel like you need more...sorry I can't be anymore helpful, maybe someone else will post soon...
Keep us informed, good luck...xxxxx