Plz house my hubby refuse me from taking folic acid he said from this…

Plz house my hubby refuse me from taking folic acid he said from this stage am not supposed to take any drugs till am 3month which I must have started antinatal so any drugs prescribed by the doctor wud be okay Plz what's the work of folic acid? Cox I don't know how to convince him am 7wks and 4 days gone