At 36 weeks, yang you're experiencing is likely Braxton-Hicks contractions, perut mengeras macam tu is super normal, tapi kalau rasa uncomfortable boleh try relaxing, minum air, or change position, they usually pass in a few minutes. A few of us mummies went through the same thing at this stage and it went away, tapi since setiap pregnancy lain-lain, better check with your doctor just to be sure everything's okay and get peace of mind!