Sayang, ketones dalam urine especially dengan GDM ni serious sikit, please check with your doctor or go to the clinic ASAP, okay? Don't wait. I know it's scary but this one kena proper medical advice, bukan just drink more water je. Your doc needs to see the results and check your blood sugar levels properly. A few of my mum friends with GDM kena adjust their diet and meds under doctor's supervision, so it's really important you get professional help for this one, mama. Jangan delay lah, better safe than sorry for you and baby. All the best!