How accurate are dating scans?

Jimmie Doerfler: when does the dating scan put you? dont forget everyone ovulates differently so if your due date is earlier then you thought then it means you must have ovulated early or if it was later then you thought it means you ovulated later. the due date is just an estimate not many babies actually arrive on their due date

Rubi Romo: an ultrasound is the most accurate. It isn't going to be the exact day but maybe a day to three later.

Shad Bushweller: depends on your cycle... do you have it every 28 days..?

Dana Russian: go by the dating scan its more accurate