Why am I bleeding?!

I have had four periods in six weeks! 1/12-1/15, 1/22-1/25, 2/5-2/9, and then I started yesterday 2/21. What could be the cause of this! It’s a weekend and my doctors office isn’t open until Monday!

Edit to add:The birth control isn’t new but the bleeding is. I went from sometimes having one period, to having one every couple weeks.