Thanks for the query.
Better to take folic acid
from one month before the pregnancy
Usually 400 to 800 micrograms of folic acid is needed during pregnancy.
But as you had previous history of microcephaly
(possibly), you have to take 4000 micrograms of folic acid per day.
This high dose can prevent birth defects in the baby.
Ideally two years break should be there as you had cesarean section but with proper followup one year gap is enough.