question do you have to schd an appointment to go take your glucose test for your 3rd trimester . or…

question do you have to schd an appointment to go take your glucose test for your 3rd trimester . or can you just walk in with your script and get it done . my doctor didnt tell me and i go to quest for lab work which of course isnt at my doctors . i have to get it done before thursday when i go see my high risk consulant so they can look at it after my sono . then my doctor needs it by friday when i go see her for my 7th month appointment . i wanted to get it done this morning but not tryna go up there for them to tell me i just cant walk up there and get it done .