KT56 - Hang in there I am sure your scan will be right. My Dr said that the risk once we have seen the heartbeat is as low as 3-5%. I am still at 3% now because of my history despite seeing baby waving to us.
I just wanted to mention I am rarely feeling any nausea, my boobs are still big but not as sore but like you turned off alcohol. But so far so good. My ob said its because the more the placenta takes over the less hcg is in the system and the symptoms ease up. Somthing like that anyway. Good luck and fingers crossed for you.