You all have my sympathies! I had horrible RLS from the end of my 2nd tri well into my third trimester. I was aware of the calcium / magnesium issue, but have found that since I greatly increased my fluid intake and significantly upped my salt intake as well, that it has by and large stopped being an issue. Interestingly, I increased my fluids and salt to address very low blood pressure, rather than the restless legs, but seem to have had a bonus spin off from it!
Best of luck

Cheers Hopefullysoon