Glucose test questions

I know the drink I have to drink and I also have a blood draw (I think) afterwards. But what else does this appointment entail? I know you wait an hour until the blood draw, but does anything else happen like being able to hear the heartbeat or another ultrasound? It’ll happen when I’m in my first week of third trimester and I’m a FTM and I’m oblivious to a lot of things. I just want to know what all of your glucose test appointments were like.