Sayang, this is really something you need to check with your doctor or diabetes nurse first, especially with GDM, they know your exact situation best and can guide you properly on fasting safely. A few of us mums dengan GDM, some boleh fast under supervision, some kena adjust. Your 4.3 reading is one thing, but your doctor needs to see the whole picture, your insulin levels, how you're managing, all that. Jangan take chances, okay? Get clearance from them dulu before you decide. Take care!