I would take 2000 mcg (that's mcg MICROgrams not mg MILLIgrams) at the least. I do think the egg may require the FA as it develops although this has not been proven. I took 4000 when I TTC DS 4, both several months before I got pg and all during the first trimester as well, but they advise that for women who had a baby with a neural tube defect like I did.

