Sayang, perut mengeras tu memang common kat trimester ketiga, tapi sebab dah 35 weeks dah, please call your doctor or go to the clinic today , better safe than sorry ok, terutama if ada ngilu-ngilu kat pusat. A few of my mum friends experienced yang sama, tapi doctor dorang check betul2 to make sure semua ok dengan baby. Don't wait, just go get it checked out ya!