Nothing from the scan

Please check with your doc if he/she has ruled out etopic pregnancy via monitoring your blood HCG. The same happened to me once and upon second or third scan, they diagnosed my case as etopic, which is life threatening. After that incident, my subsequent pregnancy, I got very paranoid and go for scan immediately after positive test, just to make sure they see the sac. As long as your doc rule out etopic, everything should be ok. Keep close monitoring until you see the sac in the scan. Hope everything goes well for you.