Does drinking water increase amniotic fluid?

Gina • Due 10/02/16 with my rainbow baby 🍼🌈👶🏻
Went for a gender US at a private clinic and the sonographer told me to drink more fluids as my AF is "slightly low" so I'm assuming it must be on the borderline of normal perhaps? I spoke to my midwife about it and she wasn't concerned and told me not to worry. Any ideas?