Depende sa stage ng pregnancy mo, pero if ang puson mo ay nag-harden regularly, kailangan mong i-check with your OB agad para ma-rule out yung Braxton Hicks contractions or any concerns. A few of us mums experienced this din, at iba-iba ang reasons, sometimes normal lang siya as your baby grows, pero better safe than sorry talaga, lalo na pag may cramping or unusual symptoms pa.