I recently found out my vitamin D levels were near non existent after blood work last week. My doctor is putting me on the highest dose of weekly supplements (once weekly for 12 weeks, then one daily as long as the weekly ones build it up.) I have recently read that lack of Vitamin D can cause problems conceiving. Has anyone had low vitamin D and had a hard time getting pregnant, and then started taking supplements and conceived? Just curious to see if this is the major reason of having problems ttc for me.