Is this normal

Coco
This is my first time ever taking BC and I'm on lo loestrin fe and I normally have my period for 3 days only the last day I'm light and that's how I know it's going off. Now I'm on day 4 and still bleeding regularly. 
I've taking 4 pills out of the pack so far. Is it normal cuz my body is changing to the pills or should I call my doctor?