Clomid questions

Melisa • 35, Finally pregnant with #1 after IVF!! Due in May 💗
So I took a break for a month, and I think it was the best thing for me. All this stuff was starting to drive me crazy. My every waking moment was spent thinking about being pregnant and stressing about why I wasn't. 
I'm going to go for my 4th <a href="https://glowing.com/glow-fertility-program">IUI</a> this cycle. I'm going to try clomid to see if that will help. First I have to go in for an ultrasound. What are they looking for? What are the side effects you ladies have had with clomid? Any other advice? The support you have given me is so appreciated 💗.