Birth control to start my first ivf cycle, spotting today??

So at the end of this month I start my first <a href="https://glowing.com/glow-fertility-program">IVF</a> cycle, so a week ago I was started on birth control. Just recently today I noticed I’m spotting brown vaginal discharge??? Is this normal, has this happened to you? I left a message for my clinic but they probably won’t be able to call me back till tomorrow. Thanks guys!