folic acid dosage

Hi, just checking what is your dosage of folic acid? Im 6w2d. Did my first check up today coz im having some spotting. Doc said it might be implantation. He gave me duphaston and want to give me folic acid. Told him i have multi vits that have folic acid (holland and barrett's ultra women) he said i can take that multi vitamins so he nv give folic acid.can u share with me your dosage of folic acid?