Even the first scan can be +/- 5 days. I always recommend taking the furthest date, that way when you are due there is less pressure for inductions and you can be most sure baby is happy to come. I know it sounds exciting like you are having your baby earlier and these days most women want to go by the latest date, but inductions are not nice and may have been done simply because baby isn't ready. To read more about inductions, click HERE. It's a real eye opener!