Late AF when taking buselerin

We have started our first cycle of <a href="https://glowing.com/glow-fertility-program">ivf</a> this month, we’re on a long protocol. I’ve been taking buselerin injections before I can start my stims, but AF hasn’t showed up yet and I’m getting a bit worried! Has this happened to anyone else? Is this normal for AF to be delayed? I’m going to phone the clinic tomorrow, because I’m getting stressed about it, I know that won’t help, but I’m going a bit crazy! My first scan is booked for Thursday, but if I don’t come on I don’t think I will be able to progress to the next stage :-(