Try not to worry, that is all they see at 5 weeks. It is too early to see anything else. I've told myself I wouldn't go for a scan before 7 weeks next time as it is really too early to see anything or a heartbeat before then. Some ladies are lucky and see a HB at 6 weeks but not everyone. I would wait a couple of weeks and go for another scan. In the meantime hopefully your levels ease your anxiety