Birth control for IUI?

Me

So I'm in the process on having my first <a href="https://glowing.com/glow-fertility-program">IUI</a>. We were waiting for my cycle and finally came in, went to see them and got all blood test and ultrasound done.

Then later that they prescribed birth control pills that I have to take until they tell me to stop. Has any other fertility doctor prescribed you that too?