Has anyone been on Prometrium?

Renee
I had my first <a href="https://glowing.com/glow-fertility-program">IUI</a> two weeks ago.  I am on clomide and trigger shot.  Following my <a href="https://glowing.com/glow-fertility-program">IUI</a> my progesterone came back at 10 which means i ovulated but my doctor would have liked it to be higher (last month it was 29).  They put me on promethium to increase progesterone in case I am pregnant.  Has anyone else taken it?  Any side effects?  And if you weren't pregnancy was your period delayed? My doctor told me it may be but I want to know if I should still take a pregnancy test.  I am on day 29, usually a 28-30 cycle. 
Thanks