There is no way to pinpoint that exactly from an ultrasound done after the first six to twelve weeks. 3rd trimester ultrasounds are notoriously unreliable for measuring the size and age of the fetus.
Your last menstrual period was likely in the first half of September. Conception was likely to be late September or early October.
The approximate date of conception was September 2nd 2009
The approximate date of conception was September 22nd 2009
The approximate date of conception was September 2nd
Sometime around July 26th
The approximate date of conception was July 3rd
The approximate date of conception was July 3rd 2008
The approximate date of conception was September 29th
September 17th 2009? Your conception date would be roughly December 26th 2008, give or take 5 days
Your rough conception date would be December 26th 2010, give or take a few days. However, it's difficult to accurately say when your conception date was. I suggest speaking to your doctor, midwife or obstetrician to get a better idea.
Roughly Thursday September 11th 2008
The approximate date of conception was January 2nd 2009
I will assume you are talking about October 26th 2011. If so, it makes your estimated conception date February 1st 2011. This date could be out by a couple of days though. It should not be used to determine paternity.