They'll most likely put you on am iv for fluids. Ketones are found in urine when you're dehydrated. I had HG with my first pregnancy and once a day I'd have to pee on a stick that measured ketones in my urine, if it was higher some days they would make me drink an extra 2 or 3 water bottles or go in for iv fluids. Stay hydrated!! Goodluck! :)
Ketones also show when your body begins to metabolize fats and proteins for energy instead of carbohydrates. Can be a sign you aren't eating enough. High ketones can cause damage to your kidneys and to your developing babys brain and kidneys.
