What due date should I use?

Amy
My LMP due date is October 21. I calculated at October 19 based on having shorter cycle dates. Then I had the opportunity to have a first trimester ultrasound at which they told me Oct 12! (According to the tech, the due dates at first trimester u/s are the most accurate.) 
So, which should I pick?! It's not like the baby will cooperate anyway so it's just for fun. 😝

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