Hi,
I can definately sympathise with you as I had the same thing happen to me.
How about getting your blood hcg levels monitored while you are waiting to go and get a scan next week?
If they check them every 2-3 days you should know what is going on before you have the scan. The hcg numbers should double every 48-36 hours in a healthy pregnancy.
This might put your mind at rest, or it could add to your anxiety if the levels are sub-optimal.
It's up to you but I found that it helped to feel like I was doing something rather than just waiting.
I'm sure everything will be fine for you and your baby, so try not to worry. 8-[