Whipping cream has 6.6g carbs / cup. In the US they round the carbs down to 0 if there are less than .5g / serving. I think they consider 1 tablespoon a serving.

I've never seen sugar free cooked pudding either, don't think it's available in Canada. I use instant and 1/2 cream, 1/2 water - sometimes it works, sometimes it doesn't!