Uy, first things first, please check with your OB directly about which date is correct, ha! Confusion about EDD (expected delivery date) is super common, lalo na if may different readings, pero kailangan sigurado kayo. So the thing is, kung may discrepancy between your LMP calculation at ultrasound, ang dating from ultrasound, especially kung early pregnancy pa lang, is usually mas accurate. A few of us moms had the same situation, at ang OB namin ang nag-clarify based sa dating scan. Don't stress too much, but definitely ask your doctor which one to follow para sa lahat ng check-ups at planning. They'll help straighten it out!