So sorry for your losses BabyG4.
My first pregnancy was a blighted ovum. I went in at 7wks to see how many babies were in there (I'd had IUI with Clomid and had 2 follicles ready to pop when ovulation was triggered) and was told there were none. My OB wanted me to have a D&C the following morning but I wasn't ready, I wanted to make sure they were right. I had a follow up scan in a week plus 3 betaHCG blood tests and they all confirmed there was no baby. My HCG was still rising but it wasn't doubling. The sac had started to shrink so I took my OB's advise and had the D&C the following day.
In your situation I would wait as well. The fact your HCG is rising normally is a good sign. Crossing fingers everything is ok and it's just a dating issue.