Eh sayang, kalau perut mengeras ni boleh jadi Braxton Hicks (practice contractions) which is normal, tapi at 30 weeks kalau rasa tak selesa or pattern nya berubah, better call your doctor atau clinic to check everything okay je. Baby aktif tu bagus sign! Tapi jangan take chances, a few of my mum friends dulu ada rasa macam ni, and they called in just to be safe, and doctor tenang-tenang je bilang semua okay. Lepas intimate sama suami ni mmg boleh trigger contractions, so relax je, minum air banyak, and if it doesn't ease in a bit, jangan hesitate to reach out to your clinic.