Is birth control necessary for IVF?

I’m starting my first <a href="https://glowing.com/glow-fertility-program">IVF</a> cycle next month and was told to go on birth control day 1 of my period, for 10 days. Doing that will put my egg retrieval and implant phase right in the middle of a trip I have planned. If I skip the birth control piece, I can have everything completed before the trip. How necessary is the birth control? Have others done an <a href="https://glowing.com/glow-fertility-program">IVF</a> cycle without it?