A.C.
J.,
I wouldnt worry about it. I had my first appt on the 28th of DEC. I was certain of my last period as well. Well guess what, when she did the ultrasound I wasnt as far along as I thought. I was right about my last period but I conceived two weeks later. So instead of being 8 weeks and 5 days I was just 7weeks along. So it changed my due date from Aug 4th to Aug 15th.
Plus, a lot of doctors now adays are nice and will do an ultrasound every visit. Which I think is awesome! Don't worry about it. And plus it is too early to hear a heartbeat w/o an ultrasound to see the heart bumping. Good luck anyways!