Im wondering when i conceived my baby because my ultasound i had on January 7th says my due date is August 5th 2009 but i had a period for 7 days on nov 2 which my periods only last 5 days?

Average human gestation is just over 40 weeks, calculated as the time between the last period and birth, so the 5th of August is probably about right. You probably conceived your baby in the cycle after your 2 Nov period.