My daughter is 14 weeks pregnant and was told during her first visit that blood work was low in vitamin d. There are so many doses of vitamin d at the store that she is confused as to what to buy. I know that vitamin d is a fat soluble vitamin and am trying to help her while she's down visiting me to obtain a safe dose. Any ideas?( she said it would be either 1000 units twice a day or 2000 units twice a day.) Also, is an a1c test truly accurate when testing for gestational diabetes? Test came out negative but she's been having feelings of low blood sugar. Has 1 past pregnancy with gestational diabetes.