Sakit ngilu kerap especially malam tu biasa sikit dalam trimester ketiga, tapi kalau perut mengeras and sakitnya intense macam ni, better you check dengan doctor just to be safe, bisa Braxton Hicks contractions (practice contractions) tapi dia orang perlu confirm especially at 30 weeks. A few of my mum friends had the same thing and doctor cek tapi semua okay je, so jangan worry sangat but do get it checked lah because first pregnancy kan takut sikit, betul?