Sayang, please check with your doctor or OB-GYN first, especially since you're on GDM diet control, they need to monitor baby and you carefully okay. A few of my mum friends who hoped for normal delivery after their first c-section, their doctors discussed timing with them based on their specific situation, so it's really between you and your OB! The most important thing is both you and baby are safe. Jangan risau, your doctor will guide you on what's best for you. All the best, mama!