Almost 36 weeks of pregnancy. The closer it gets, the scarier. My first…

Almost 36 weeks of pregnancy. The closer it gets, the scarier. My first pregnancy ended very badly. I'm only setting my sights on the good. I'm trying to rest more. According to ultrasound, the baby is large. I'm afraid that before delivery, the baby will gain even more weight. What should I do so the baby doesn't gain weight? What diet should I follow? Can there be some exercises?