PLAN B PLEASE PLEASE PLEASE HELP !!

Asija

HI ladies I'm in need for some help ! I took a Plan B two weeks ago for the 1st time. In the first few days I experienced the normal side effects and got my period exactly a week early. Now 2 weeks after after taking the Plan B, I'm having headaches and real bad stomach pain to the point where I don't even want to walk... Is this normal or should I go to the doctor ?