Question for mommies

So, iam very concerned with this pregnancy because im in the middle of transferring to another doctor so im super late on my glucose test. Not sure what to do... Im slightly over weight and i haven't been seen in 3 months almost because of this transfer. They keep rescheduling my appointment. Anyways, i eat anything and i get extremely tired. I mean they are big meals but I'm just wondering if you guys think it's gestational diabetes or if it's just being in the third trimester. I'm 28 wks pregnant