Glucose test early?

Hi first time mom here and i’m stressed. I am 15 weeks and my provider is wanting me to do the 3 hour test already. She mentioned it’s due to my BMI being over 25… Has anyone else heard of this?? I took the 1 hour a few weeks back and didn’t pass so i am a bit nervous and anxious regarding the 3 hour test. If anyone could give some insight or some words of encouragement that would be great. No one I know has had GD so i’m going in very blind. TIA