first round & apt. I'm nervous 😩

Heather • 💙Otto Wayne 9/7/18 💙💚Owen David 5/22/20💚
We have been TTC for two years and have decided to take the next step...This will be my first round of clomid. My apt is on Thursday I will be on cycle day 4, they will do an ultrasound. What are they checking for and what should I expect at my apt?
I really have no idea how this works yet.
Thanks!