Hello, I am a 27 year old female, and 7 weeks pregnant. Last Monday, I went for an ultra-sound to listen to my baby's heartbeat; the Doctor could not hear it, so she asked me to go and get some blood work done to check my HCG levels. A nurse from her office called back today and said that my HCG went down from 67,000 to 45,000. What does this mean?