Eh, perut mengeras di week 23 biasa lah tapi kalau dah tekan-tekan and gerak baby cam lain dari usual, better jangan risau sendiri, gi je tengok doctor or call your clinic cepat-cepat, tak perlu tunggu emergency room, they can check properly in 10 minutes je. A few of my mum friends pun pernah alami yang sama and semua turned out okay, but the peace of mind is worth it, especially since you're noticing the movement is different!