Sayang, perut mengeras boleh jadi normal, tapi kalau dah 3 hari dan disertai cramp feeling, please see your doctor or go to the clinic soon , better safe than sorry, especially first baby! A few of my mum friends pun pernah rasa macam tu during pregnancy, tapi doktor tetap check je to make sure everything's okay. Jangan tunggu, pergi je minggu ni, okay?