First time for EC

Okay so I took the morning after pill to be safe and I had some cramping with that. I know that's normal but then later that night the cramps got sooo bad. The worst I have ever had. I got a migraine. Also the worst migraine I've ever had. Then I got the cold sweats and threw up. WHAT IS WRONG?! Is there something actually wrong or is this normal. I've never taken EC before this.