Pregnancy Dates More Condition_symptoms Need Some More Answers As To Pregnancy Dates..can Anyone Help Me!!?

Need some more answers as to Pregnancy Dates..can anyone help me!!? - pregnancy dates more condition_symptoms

LMP - about 26th January 2008
5 ultrasound - has weeks/4days me at 10!
Maturity - November 16, 2008.
This would imply a cycle of 41 days. However, my periods are usually on time, but scans of 5 I have 2 weeks behind what it should be! Can someone help me calculate my time of conception? and the time was by my 5 LMP or ultrasound-go! I know it should not matter, but because of my situation, it would be appreciated all your help!
Thank you!