Month long period on the Pill!!!

Amine

So I just started taking BC on June 17th on the first day of my period as indicated on the pack (Yaz) its been 21 days and my period has not stopped since then! Is this normal? Should i worry? I read that it usually takes 2 or 3 months for your body to adjust to the hormones, does that mean I can have a 3 months long period?

My period is not heavy but its annoying and also i get light cramps from time to time.