will be 36 weeks sunday! need advice

I have a doctors appt tomorow for check up and since ill be 37 weeks sunday and i have a csection planned for 39 weeks. I have been worried about blood sugar constantly dropping randomly where im checking my sugar every 2 hours literally. And than my first pregnancy. I had low amotic fluid so i was told to have my doctor check it this time i keep asking my ob if can get checked and he goes lets wait and see. And honestly i dont want to wait and see. How do i go about it in a nice and stern way? I want to make sure i get the order to get the ultrasound.