Clomid Ultrasound

So, my doctor never booked me for an ultrasound or any tests to see if Clomid is working for me. What exactly does the ultrasound show? Is it just if you ovulated, or will they be able to tell if you’re likely going to end up pregnant? Is there a specific time that you need the ultrasound booked for to be able to see?

What other tests should I be getting done, and how often/when?

Thanks in advance guys! Wish my doctor was more knowledgeable 🙄