Ahhh I feel you lah, constipation during pregnancy is the worst, a few of us went through this around that stage and it's honestly so frustrating when nothing seems to budge! Besides the water and fruits you're already doing, try adding more fibre slowly (like oats, beans, leafy greens) and some mums swear by a warm glass of milk with a bit of honey or prune juice in the morning, but honestly at 25 weeks with the cramping you're having, best check with your gynae or midwife lah to make sure everything's okay and get their advice on what's safe for you specifically. You've done the right things already, so don't stress yourself more, your baby's fine, but your comfort matters too, and they can recommend something that works without any worry. Hang in there, mama!