which due date should I go by?

my original edd is August 4th but after an ultrasound yesterday they said my due date moved to August 1st. Not a huge difference but I'd like to still be prepared. Should I change this app to the new given edd or keep it as is. The app currently says I'm exactly 14 weeks today. The new due date states I'm actually 14 weeks & 2 days. Which date should I plan for ?

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