Uy, normal lang yan sa 30 weeks, yan ang Braxton Hicks contractions, parang practice contractions ng katawan mo for the real thing! A few of us moms felt that heaviness din, parang may tinitiguan ng pressure sa puson, lalo na pag gumalaw or nag-stretch ka, pero as long as walang discharge, bleeding, or super intense pain, usually okay lang. Pero tama na rin na i-mention mo sa OB mo next visit para peace of mind mo, especially kung biglang intense or consistent na ang sensasyon, mas better safe than sorry! Congrats sa pregnancy!