Alah normal je sayang, tu Braxton Hicks contractions, perut jadi keras tapi tak sakit, memang boleh terjadi dari second trimester lagi! Quite a few of my mum friends experienced this around that time and their doctors said it's just your uterus practicing, nothing to worry about, tapi kalau ada bleeding, sakit teruk, atau frequent sangat, better check with your gynae just to be safe la.