15 day long period. is it normal?

Dina
I recently stopped my BC pills (Yasmin) because they were making me depressed and anxious. When I finished the pack, I went through the regular withdrawal "period" and then about a month later I got what I assumed was my first normal period after quitting BC pills, however it is day 15 and I am still on my period. Around day 5 - 10 the period was very light only needed 2 panty liners a day, but from day 11 until now it's been quite heavy. 
Is this normal after stopping BC pills or should I go to a doctor ?