5w2d. anyone have an ultrasound around then?

Al
Had my first OB appointment this morning and judging by the ultrasound and "sac" I am estimated about 5w2d but it's only a sac at this point. My dr said that is normal and not worried at all. I go back in 2 weeks and have another done. From everything I'm reading for this stage I should have seen a little tadpole looking thing. Now I'm worried. 

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