I had my first appointment yesterday and I LOVED my new provider. I was calculating 9w 5d based on my LMP. I got a message from her today that said I'm actually measuring at 7w 2d and my new EDD is March 7th. I know these can change, but does this mean I should leave this group and  join the March '17 ladies instead? :( how frequently do they change the due date and how long should I wait to adjust all my other dates if necessary? I haven't been having a very easy time so I was also pretty bummed out to learn I'll probably be pregnant 2 and a half weeks longer than I originally thought.