bad cramping

I took Plan be January 11th, got my period when I was suppose to but it was soooooo heavy to the point my doctor said I need iron in my system so that's getting taken care of I got supplements and eating liver and so on. My period ended but now I have baddddd cramping and my stomach looks bloated. I'm using a heating pad and going to drink some ginger tea but why do I have bad cramping .. and it started from the morning stop and now it's back again. Is it because of the pill ??