Glucose tolerance test

Hey all. Went for my first gtt at 13 weeks and passed. My doctor likes to screen again at 28 weeks so I have to go again. She didn’t give me a script the last time I was in for my appt so did I need to get one or are they able to see who to send the results to since I have already done it? Silly question but I forgot to call today and with the holiday coming up and my next appt next week I’m on a time crunch and wanted to schedule to have it done ASAP! Thanks.