Eh, at 37 weeks perut keras tu memang normal, bab tu Braxton Hicks contractions, basically practice contractions lah But if they jadi regular, painful, or ada bleeding/water breaking, kena go to hospital terus, jangan tunggu! A few of my mum friends yang 37 weeks pun experience yang sama, so you're not alone, best ask your doctor about it at your next checkup to be sure everything is okay!