i hope things go well for you, but i thought maybe it was twins to start with, as your hcg levels did seem quite high to begin with but maybe you did lose a twin and that is why the numbers have not increased as much, but are still increasing as the other twin keeps growing. i'm not an expert, but maybe that would explain why the numbers have not doubled as much as expected for a twin pregnancy. just to add i am due the middle of october and i got my hcg levels done on thursday and i got a level of 6500, so your levels seem ok to me. wishing you all the best x