Am I losing this pregnancy?

Taylor
I went in today for an ultrasound at 8 weeks. The technician told me that she couldn't tell me anything and that my doctor would be calling me. Well, I just got off the phone and I am only measuring at around 6 weeks. All they could see was the sac, too early for a heartbeat. This happened to me 6 months ago when I went in for my 12 week ultrasound but babe only measured at 9wks. My doctor told me she wants to do a blood HCG test over the next couple days to see if my levels are going up or down. I honestly would just like to know what's going on rather than waiting to hear for another 4 days. Anyone go through something similar?