When will I get my period?


I switched to Junel almost 3 weeks ago. I’m on the 21 day pack so there are no placebo pills it’s just a week without pills at all. Since I started the pack in the first day of my period will I still get it during that last week? I’m just a little confused because it would be a week early but I’m pretty sure once I get regulated it should all work out. I hope my question makes sense.