The change those all the time. Based on my lmp my due date was may 22nd .. Then when I had my first u/s it was changed to june 5th. Since I haven't had my baby yet I guess they was right, so i'd say go by the date they gave you on your scan...

Ok, thanks for that! I'll have to change my dates around then!

Always go by the later date ~ unless your doctor changes it. My scan said I was due a week earlier than my .L.M.P. But my doctor never changed anything. I got my hopes up that I was, in fact, a week further along than I thought and I set my sights on that date. Imagine how utterly devastated I was when I went overdue from my .L.M.P by a week. So, 2 weeks after the scan's estimated due date, I finally had her.

They are called estimated due dates for a reason. It is only an estimate.

Scans are extremely accurate during the first couple of weeks. Lmp is not very accurate because not all women ovluate on the 14th of the month every month. I ovulate on the 18th, so if they gave me a due date by lmp, it would be 4 days too early.