Hello, I Had My 6wk Check Up From Having My

Hello, I had my 6wk check up from having my aim on 3 27 15 and I had already started my menstruation cycle on 3 25 15 I was giving depo shot as birth control on 3 27 15 and I am still having a period as of today almost 3 weeks later is this normal or should I call my doctor ....thanks