Aih, perut mengeras ni memang biasa during pregnancy, tapi kalau lama sangat dan baby kurang gerak, better check with your doctor lah. A few of my mum friends kena macam ni around second/third trimester, dan dorang scan found it was just Braxton-Hicks contractions yang normal, but some cases kena monitor closely. At 27 weeks perut yang keras + kurang gerak tu patut tak main-main, so jangan delay, hubungi clinic atau go for a check-up to make sure baby okay!