Which date should I go off of?

Courtney
My LMP was July 23rd which puts my due date at April 28th. At around 5 weeks blood work put me behind at about 3-4 weeks but an ultrasound measured me at about 8 weeks 3 days on September 22nd which would put my due date at April 30th. I know it's a 2 day difference but I am all about numbers and faces so curious what date should I base my due date at? Right now I'm 10 weeks 2 days if going off what the ultrasound measured me at. 

Vote below to see results!