Diabetes & pregnancy help!!!

I've been diabetic since I was little I've had it under control this pregnancy until right now 
For dinner I only had a chicken sandwich fries n a Diet Coke within an hour and a half my sugar was 409 I'm so worried what should I do I already contacted my doctor by email n call but she won't answer till morning I'm 27 weeks
I eat healthy n cut carbs like I said I've been diabetic since I was small I know how it all work ( to the ones who think I don't do it it or know)