Testing a trigger?!

Hey y’all. So I am on to <a href="https://glowing.com/glow-fertility-program">IUI</a> #2 soon and this time we are going with clomid and a trigger shot. Round 1 was natural <a href="https://glowing.com/glow-fertility-program">IUI</a>. I keep seeing “testing out the trigger,” can some ladies fill me in on what to expect with this cycle with clomid and trigger shot?