Sayang, ni memang boleh buat takut! At 27 weeks, kalau bayi tiba-tiba jadi keras then gerak jadi slow, jangan tunggu, pergi jumpa doctor atau ke emergency sekarang jugak, okay? Ini bukan something nak observe di rumah je. A few of my mum friends ada experience uterine tightening yang normal, tapi kalau followed by slower movements, doctor perlu check. Better safe than sorry lah, especially when you're worried macam ni, trust your instinct, mama. Call your clinic or go to the nearest hospital now, jangan delay.