Jangan risau sangat, dear, yang you describe tu sounds like Braxton Hicks (false contraction), sebab true labor contraction biasanya makin lama makin kerap, makin kuat, dan sakitnya tak hilang walaupun you rehat atau tukar posisi. Kalau perut mengeras tu datang every 30 minit tapi tak progressing jadi lebih rapat dan lebih sakit, kemungkinan besar itu just your uterus "berlatih" je. Pasal takut kena marah nurse tu, please don't worry, they are there to help, and it is truly better to go and be reassured than to stay home and wonder, especially being a first-time mum. Do check with your own doctor or O&G specialist to be sure, because every pregnancy is different and they know your case best.