Failed IVF - could blood test be wrong?

I had very positive feedback during my ivf cycle and was sure it would be successful...took a blood test 12 days after embryo transfer with a negative result...is it possible that the test was taken to soon? Any comments would help.

[paranoidpatty]

I believe the only way that the blood test would be wrong is if it was just a qualitative test and not quantitative. In other words, if they gave you an HCG count (quantitative) then you would know that if it was over 5 then chances are, you are pregnant.  A qualitative test will only tell you yes if your HCG count is over 25.  You can also be preggo with a lower number than 25, so yes, there is a chance that it could be wrong if that is the type you had.

Good luck!!