Why Am I Experiencing Prolonged Light Bleeding After Starting And Then Stopping Daphne Pills?

Hi! I started taking Daphne pills last July, I was on my 5th day of menstruation that time. Then before I even finished that whole pack of the pills I started spotting and bleeding and now Im on my 10th days of bleeding but it s not heavy bleeding it s just like 1 napkin not full a day. And I know Im not pregnant coz I don t had sex. So I decided now to stop taking daphne. What do you think of why I m bleeding longer?