I have only taken elevit which has good levels of iron so not sure why you'd need more ... however do talk with your ob about this as you dont want to be overdoing it. Also try and eat iron rich foods instead to compliment your elevit rather than take another supp eg raw almonds, spinach, licorice, dried apricots and the like. I am sure your naturopath friend can give you a list of foods that fit this category.
Hope this helps