Early Period before IUI

We are scheduled to start <a href="https://glowing.com/glow-fertility-program">IUI</a> this month at my new cycle, and AF just appeared 4-5 days early. I’m excited to start the process earlier now, but I’m a pretty regular 26/27 day cycle and this one was only 22 days so now I’m worried something internally is thrown off! All blood tests have been normal/good so far, but this change in my cycle worries me!!