Aiyoh ini Braxton Hicks lah most likely, especially at 38 weeks, perut mengeras tapi tak ada contraction pain yang proper atau cervical changes lagi. A few of my mum friends went through the same thing towards the end, very confusing! Tapi sebab you're so close to due date, best la you call your doctor or midwife just to confirm everything is okay, especially kalau hari-hari ni terus mengeras or ada anything else that feels off. Jangan risau, this is super common at this stage!