Trigger shot..Help!

Ka

My RE has me on Clomid, with Ovidrel as the trigger. We have a diagnosis of unexplained infertility, and we want to try a round or two of Clomid with timed intercourse instead of an <a href="https://glowing.com/glow-fertility-program">IUI</a>. Because I ovulate on my own already, I am confused as to why I would use the trigger shot? Anybody have any insight to this or suggestions!?

Thanks!