Sayang, perut sakit dan memulas macam tu pada 28 weeks memang boleh jadi normal Braxton Hicks contraction, tapi sebab ada pinggang sakit sekali, I think you should call your doctor or midwife today to check, jangan tunggu lagi, just to be safe ok? A few of us pregnant mums experienced something similar dan turns out semua ok, but some things better confirm dengan medical team, they'll put your mind at ease!