I was told just to take a prenatal vitamin. I track the foods I eat on a website to make sure I get the right nutrients and calories,carbs,etc. so I make sure I try to eat foods rich in folate,too.
BTW, we have been trying since July with no luck (except for the month of January since I had surgery.) I anticipated a bit of a problem since I am of advanced maternal age at 37 LOL! (That's really what they call it)
Good luck to you!