Alhamdulillah tu bagus tau, weight loss during GDM pregnancy is actually normal and healthy kalau you're managing your blood sugar well, which means you're truly sticking to the diet and avoiding added sugars, so baby is fine as long as you're eating nutritious food. A few of us GDM mummies in my circle noticed the same thing, and our doctors said it's because we're being so careful with carbs and sugars that our bodies are using stored fat for energy, definitely a silver lining! The good news is this strict eating habit you're building now might help reduce your risk of developing diabetes later, especially with your family history, so hopefully it'll stick with you postpartum juga. Keep checking with your doc setiap monthly visit to make sure everything's on track with baby, tapi honestly sounds like you're doing amazing.