Miscarriage, ectopic, or just early?

Eva

My last period was 6 weeks and 5 days ago but ovulation was 3 weeks ago. I went for an ultrasound yesterday and they weren't able to see the baby. The doctor didn't sound hopeful and took some blood. Today I got a call back and my HCG numbers were at 11,900.

Could I just be early? Has anyone experienced this before?

I have a bit of hope left but I'm being open minded.