It's hard to say regarding multiples as some women say they had lower hcg in their multiple pregnancies than singleton. At 4w6d (21 or 22 DPO) mine was 18,762 with my daughter, which was high according to websites but my OB said he has seen hcg all over the place and doesn't use it to even guess at how many, and only a scan will give that information. Sooooo, it could be one or it could be more; just too hard to tell without that scan. Good luck!