Oo, normal yan mama! Around 30 weeks, ang Braxton-Hicks contractions (practice contractions) ay nagsisimula na talaga, kaya parang tumitigas ang tyan nang biglaan tapos relaxes lang after a few seconds, iba ito sa actual labor pains. A few of us mums naging worried din kaya nag-consult, pero sinabi ng doctor na part lang ng pregnancy, especially sa third trimester. But since you're concerned, best to mention it sa OB mo next check-up para sure, lalo na if may pain, spotting, or kung ang contractions ay regular na at malakas na, mas okay kang mag-peace of mind!