What is the purpose of being put on birth control pills before starting the <a href="https://glowing.com/glow-fertility-program">IVF</a> process? If I have regular menstrual cycles do I have to be started on it?

I first had my consultation with my specialist in July. After all the blood tests, an U/S, a hysteroscopy, and an MRI, this month I'll need to have a Laparoscopic surgery to remove what my doctor thinks is a septum in my uterus. He said after the surgery he'll put me on birth control pills before we start the <a href="https://glowing.com/glow-fertility-program">IVF</a> process.