Hi first heartier congratulations for your upcoming NEWBORN.
Its very common during pregnancy
there is high level of blood glucose
which gives effect as that as of diabetes
.It should be controlled and it is easily controlled by easily available medicines.There is NO nothing serious abt this and need to be afraid BUT it is higly RECOMMENDED to be under medical suprvision to have a assess with HIGH GLUCOSE LEVELS...................you can avoid foods in high starch level/increse diet in high roughage /do meditation/yoga
some light exercises/walk