Eh, 29 minggu na, memang perut tu boleh jadi keras-keras macam itu lah, biasanya Braxton-Hicks contractions, especially kalau dah masuk trimester ketiga! A few of my mum friends experience the same thing, and yang penting as long as tiada bleeding, spotting, atau rasa sakit yang teruk, usually okay ja. But sebab ni pregnancy worry, better check dengan doctor or midwife next appointment you punya for peace of mind, especially kalau sering sangat or kalau ada yang buat you worried.