Wa'alaikumassalam! Yes, tu normal sangat at 30 weeks, Braxton Hicks contractions tu memang kerap jadi kat stage ni, perut mengeras selang beberapa minit then relax balik. A few of my mum friends panicked awal-awal juga thinking something's wrong, tapi it's just your uterus practicing for labour. Tapi kalo the tightness tu painful, atau ada spotting atau discharge, atau contractions jadi lebih frequent and regular, better check dengan your doctor just to be safe, okay? Drink plenty of water and rest more, sometimes dehydration or too much activity boleh trigger lebih banyak.