HD 3D/4D imaging will only work for you if you have plenty of amniotic fluid around baby we like to see mom drinking 4 to 5 small water bottles a day each day at least 7 days prior to your scan date. This will help you achieve a balanced fluid level, however starting 2 days prior to scan date will not help very much and could lead to poor image quality try and give yourself the best possible chance at clear images and make sure your hydrating starting at least 1 week prior.