Anyone with low hcg???

Sienna

I got a very faint positive pregnancy test at 12dpo. Today at 14dpo (day of missed period) my test line was darker, but I had blood drawn and my hcg was only 16. I feel like I implanted later, maybe like 10-11dpo. Would that make a difference? I feel like 16 is just so low😞 I’ll be going back in 2 days for a repeat, just looking for some hope in the mean time!