Ketones in urine!

Anyone else had ketones in there urine? I am 36w1d and I just checked on my urine results from today and it is showing moderate ketones. I also lost 3 pounds in a week. Anyone else had this and if so what does it mean exactly? My doctor didn't mention anything to me. When I looked it up it said I need to drink more water but I feel like I drink a lot of water already.