Can birth control kickstart an early period?

Lacy

So two weeks ago, I just got on birth control for the very first time. It’s the pill. My OB told me to start taking it the next time my cycle started so I did, which was two weeks ago. And just yesterday, I started spotting and my cycle has fully started again. Before, my cycle was normally 5-6 days a month. Is that normal to start early on birth control? Or should I call my OB?