My MIL is an OB/.GYN nurse at a hospital. I had my very first u/s with her at 9 weeks and she gave me a EDD of March 15th. To my understanding, that would be the most accurate EDD, however, at my 20 a/s they told me March 11th and at my level II u/s they also gave me a March 11th EDD.
Probably stupid because I know baby rarely arrives on those dates, but which would you go with?