If an ultrasound determined that you are 8 weeks and 1 day on April 23 2008 is it possible conceived Feb 29 2008?

No, it is not possible that you conceived on February 29, 2008, if an ultrasound determined that you are 8 weeks and 1 day on April 23, 2008. Pregnancy is typically calculated from the first day of your last menstrual period, and 8 weeks and 1 day of pregnancy would be closer to 10 weeks from conception. Since February 29 is not a leap year, it would be impossible to have conceived on that day in 2008.