Gestation diabetes

I was just wondering when everyone got the test done for the gestation diabetes? My doctor hasn't really seem consurned about my pregnancy at all but I went to an appointment on Monday at 26weeks4days he said for my 28week appointment I would get it done. But then said he would see me at 4 weeks and scheduled it for when I'm 32weeks4days. I've called and asked and they said it's fine the doctor ment to do that. Basically is it okay to get all that testing done so late?