Birth Control Mishaps

I just started a new birth control named Loryna (a form of Yaz/Yasmin), and I haven't had a period yet. It has 24 hormone pills versus the 21 my previous birth control had before. Typically my cycle was super regular and came on the same day every month, but now there is nothing. I took a pregnancy test even though the chances were slim and it cams out negative. Has anyone else experienced this/is this normal?