Oo normal lang yan, mama! Ang tummy tightening na walang pain or regular contractions ay Braxton Hicks lang, lalo na sa third trimester, maraming mums namin ay nag-experience din nito around your weeks, especially with anterior placenta kasi mas nadarama mo talaga ang movements at tensing. Since okay ang ultrasound at NST mo, you're good, pero kung ever na magsimula ng regular painful contractions or may unusual discharge, check with your OB agad ha! Enjoy your last weeks before October baby arrives!