I've had really high hcg in both my pregnancies. When they did bloods at 12 weeks for the downs screening it was 3x the normal with my first, and this time it was 5x the normal! Coupled with a lowish papp-a it gave me a high risk for down syndrome this time, but we had the amnio and it has come back clear. The doctors think I'm just one of these people that make a lot of hcg. They said it could indicate some placental issues further on and I might need a growth scan at 32 weeks but they arent concerned.