Aiyoh sayang, 36 weeks dah! Perut mengeras + kencing kerap tu boleh jadi Braxton Hicks (practice contractions) atau pressure dari baby yang dah besar, tapi please go see your doctor or midwife asap , better safe than sorry at this stage, especially if the hardening becomes painful or regular. One of my mum friends kena sama at 36 weeks, turned out baby was already quite low, so her gynae just monitored closely. Don't wait lah, get checked out!