Ish, mesti uncomfortable gila kan! Tapi honestly, kena jumpa doctor atau midwife ko cepat, jangan tunggu, even kalau takde contraction pun, sebab rasa berat dan kembang macam tu kena check betul-betul, especially at 30 weeks. A few of my mum friends experience something similar during pregnancy, tapi setiap orang lain, bisa normal stretching, bisa tekanan baby, atau ada things yang kena monitor. Jangan self-diagnose lah. Go see your gynae or go to hospital antenatal clinic mana pun closest to you, ok? Better safe, especially first time mom. Makcik would do the same!