HCG levels 884 at 5 weeks 3 days?

My levels have been very low this pregnancy. I got my BFP at 14dpo and we did my first hcg level. I have had them drawn every 2 days and they have gone like this: 14, 24, 31, 61, 176, 420, 884. today I would be 26dpo or 5 weeks 3 days. My numbers are more than doubling every 48 hours but they are still low for how far along I am. I realize it is a pretty broad range for what is acceptable. Has anyone ever had this happen and had a successful pregnancy?