Please anyone I'm panicking.

Courtney
AS OF RIGHT NOW I AM SIX WEEKS.
On Sunday night at almost midnight my HCG level was 4681.
On Tuesday morning at around 11AM my HCG level was 5892.
Today (Thursday) at 9:30 AM, my HCG level was in the 7000s. 
Why is it not doubling? Is it okay? Can anyone relate? Please help