1pj - how scary for you..... it's very early in your pregnancy by the sounds of things.... and like the girls said, you can't see much if you are only 5wks pregnant.
Once you are about 6wks3days pregnant onwards you can see more. A HB is usually only detected from about 6wks onwards..... especially after 7wks... that's why i chose to wait til 8wks to have my scan.
If you can wait 2 more weeks then have another scan you will see more hope all is fine anyway.