I'm due aug 30th according to ultrasound at 12 weeks, 1st ultrasound at 6 weeks said due date aug 29th, my lmp nov 18 need my conception date range :)?

US dates: The ultrasound dates are most accurate. If the us at "6 weeks" estimated that the baby was actually 6 weeks. You likely conceived about 4 weeks before that date.

Early US: Early ultrasounds are very accurate. Your 12 week ultrasound and 6 week ultrasound are within a week of each other. Hence your due date is based on your early ultrasound.