Sayang, perut mengeras dan rasa berat macam tu boleh jadi Braxton Hicks (practice contractions) yang normal, tapi sebab you dah 28 minggu dan feeling persistent macam ni, please check with your doctor or go to clinic/hospital tau , just to be safe, ok? A few of my mum friends had similar feelings and turned out fine, tapi better confirm je dengan doc. Jangan tunggu kalau ada cramps yang teruk or spotting ya!