A.L.
Please wait a week or so and go back for another ultra sound. I have been having bleeding during my pregnancy and i went for an US at 5 weeks 5 days and they did see everything but it took a long time and the US tech said it was very difficult to get the picture and only the fact that she has been doing it for a very long time is the only reason she could find it.
I went back a week later for another one and again she had problems finding it, but eventually did. She mentioned that while some techs are pretty good it can take a lot of experience sometimes to get all the pictures. I am so glad i had her as a tech and i am making sure to ask for her everytime i go.