I have experienced a bad test result with my second son. However, it was not on the glucose test. It was from the blood test for screening for defects. Let me just say, they do make mistakes. So don't stress yourself out about it. They told me that my son had a high chance of having Edwards Syndrome (I think that was what it was called). But he is 100% pure healthy mean boy!
No problems at all! So, think positive and we will all pray that your second round comes back with a clean bill of health!