Sayang, at 30 weeks with GDM, frequent contractions without any signs of labour ni memang perlu check dengan doctor or midwife cepat-cepat, better safe than sorry, especially with your blood sugar to monitor jugak. A few of my mum friends dengan GDM pun alami Braxton Hicks yang frequent, tapi they all went in to rule out anything serious. Could be practice contractions, but doctor kena assess properly lah. In the meantime, try rest as much as you can, drink plenty of water, and monitor closely, kalau ada spotting, fluid leaking, or pain yang different, go to emergency tau. Take care of yourself!