Duphaston and iui

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I had my first <a href="https://glowing.com/glow-fertility-program">iui</a> in feb6. And been reading alot about it since then. I noticed that most or all the experiences i read where women take duphaston after <a href="https://glowing.com/glow-fertility-program">iui</a>. 
Is it necessary to take it ? My dr didnt give anything to take. He just asked me to keep taking folic acid and relax. 
Please anyone know if i should or shouldnt take ?