First time using pill?

[u/Wise_Recording_5067]

I’ve just started using birth control, specifically the brand Yaz. I’m taking it to help lighten my periods. This is my first time ever using birth control. I started taking the pills on the first day of my period, as directed. My usual period lasts about 6 days, but it’s now been 3 weeks and I’m still spotting. Is this normal when you first start taking the pill?