Be VERY careful with those low carb breads. Some manufacturers are doing a bait-and-switch with them. That is they subtract the fiber grams from the total carbs, so the "net" carbs looks reasonable.
For example:
total carbs 12
fiber grams 7
That would look as though the bread had 5 net carbs. But if you plug the total cals, total carbs, total protein andfiber grams into a hidden carb calculator, you'd find that the real total carbs is 20, not the 12.
So be very, very, VERY careful with these products and either do the math in the store or jot down the numbers and use a hidden carb calculator BEFORE you purchase it.