My hcg levels were only 84 the first time they took my bloodwork. I'm now at about 7 weeks and they're still only at about 1900 but my doctor says she's really happy with that. I go for my first ultrasound monday. I've got the same medical history as you and my doctors said the same thing as yours. Ectopic, Blighted Ovum, etc. Keep me posted! Hope everything works out.
I am 6 weeks 2 days pregnant and my Beta Hcg was 60,056. How far along are you?
Here is a website that tells you whats normal.
http://www.stages-in-pregnancy.com/beta-levels-in-early-pregnancy.html