Sayang, perut mengeras dan sesak nafas macam ni kena check dengan doctor ASAP, okay? Especially dengan sakit bawah perut sekali, better safe than sorry at 33 weeks. A few of my mum friends experienced similar things but turned out kena kontraksi atau ada tekanan lain, jadi kena monitoring closely. Jangan delay lah, go to your clinic or hospital hari ni jugak so they can do a proper check and put your mind at ease. Baby aktif is good, tapi symptoms macam ni kena professional assessment. Let me know after you see the doctor, eh!