I agree with the previous posts it sounds as though everything is normal and it was just too early. Whilst mine did end in a mc I had a scan at 6+4 which only showed the ges sac and yolk sac and there was a lot of talk about blighted ovums ( the embryo didnt appear until 8+3) BUT my HCG peaked at 9500 and was only going up by very small amounts (around 200) every 4 days, I was bleeding and I had lost all pg symptoms other than my breasts so don't give up hope just yet as your hcg levels and symptoms are a very good sign that all is normal