Thanks everyone - this is all very helpful. I am actually really surprised re my vitamin D because I take Elevit daily plus a high dose fish oil (I've read fatty fish is high in vitamin D though that wasn't why I was taking it- I take it for development of baby's brain and also for my own skin). My OB said take D supplement once a day but I didn't mention the Elevit etc. I'll quiz her when I see her on Monday.

Ps I've read about the high blood sugar and low vitamin D link too though it seems nobody knows what the link means, just that it's there and the two often go together.