Late this afternoon, my period arrived. I had hoped it would be on the early side as it doesn't usually take long after I start the pill, but you never know. Happily, I was right! It was too late to call my PGD coordinator, so I'll do that first thing tomorrow morning. Tomorrow is also my mom's birthday.
So looks like I'll be starting stims soon. Don't know if I'll need a baseline ultrasound first or anything. We shall see.