The only sign i had was polyhydramnios... my first glucose test was at the high end of normal but my tummy was huge and my scans showed the high amount of fluid, and so they decided id better do the second test... and yup i had GD. I didnt feel any other symptoms at all... not a single one... it took insulan to keep my GD undercontrol, diet alone just wouldnt do it not very nice.