Aiyo, at 14 weeks baru lagi tapi perut dah tension macam tu memang boleh happen lah, some of us felt stretching and tightness even earlier, especially bila kandungan kedua sebab uterus dah pernah stretch before. Malam worse because you're lying down and maybe eating closer to bedtime, so boleh rasa bloated and uncomfortable je. Try sleeping on your left side with a pillow between your knees, minum more water through the day (not malam), and maybe avoid heavy meals before sleep, a few of my mum friends said yang simple adjustments macam ni helped lots. But honestly if the hardness comes with pain or any spotting, or kalau it's consistent and bugging you, check with your gynae just to be safe, okay? Every pregnancy is different so better to confirm everything good!