Ive been mestruating for 16 days now since stopping the pill. I h...

Ive been mestruating for 16 days now since stopping the pill. I had gone through 1 pack and the day I was starting my next pack I started my period, the 16th of Dec. I stopped the pack 4 pills in and haven't taken any since! But Ive been on my period for 16 days! Anyone else have this problem after stopping?!? I started Yaz 7weeks after having my son in October and had 1 regular period before taking it. Now Ive got this monster and it wont go away!!