Oo naman, normal lang yan mommy! A few of us had the same situation, and the OB said it's okay, ultrasound dating can have a margin of error, especially depending kung kailan ka nag-scan. The important thing is your baby's growth is on track, so don't worry too much about the one-month difference. But just to be extra sure, best to confirm with your OB sa next checkup para ma-clarify nila kung ano ang final dating for your due date, kasi yan ang gagamitin nila pag kailangan na mag-induce or deliver.