Iui and trigger

Stepfanie

My doctor wants me to do have an <a href="https://glowing.com/glow-fertility-program">iui</a> done with my next cycle however I keep seeing people posting about have a trigger done before they have the <a href="https://glowing.com/glow-fertility-program">iui</a> didn’t. My doctor hasn’t said anything about a trigger. What is it and should I ask ?