I too am interested to find out anyone's HCG levels in early pregnancy & to find out if this means chance of twins:

Tue 11DPO (3wks 2days) HCG=55, proj=112
Thu 13DPO (3wks 4days) HCG=196, proj=117

As I read that levels are supposed to double every 2-3 days & be around 100 on 14DPO. Mine quadrupled in 2 days, so pondering the chance of twins.