Low hcg level- so worried!

Went to get a blood test today and got the levels back- 25 hcg. I think I'm 5 weeks along. Doctor said I could be earlier then I thought- or that I'm loosing the baby. I'm devastated.  
​I've had no spotting or bleeding. Just light cramping and nausea.
​I don't know what to do- how to act until Friday and those results!! ?