Glucose Test ?

I will be 27 weeks and 5 days at my next appt and I was told I would have to have my Glucose Test done before 28 weeks. I also read its usually given within 26-28 weeks.. They told me I was scheduled for the glucose test for my last appt but somehow made a mistake and decided not to give me the test then but yet they still haven’t scheduled it for my next appt. Is there a reason they are holding off because I feel like I should be taking my Glucose Test already especially since I will be 32 weeks at my next appt after this upcoming one.. I’m just ready to get it over with already!! Anybody else had a late glucose screening? Is this normal?