Horrible cramps

So I barely ever get cramps, but this time before my period even started I started getting cramps (and they weren't so bad). But today(4th day of my period) I started to get really bad cramps that come & go every 30mins. I even took 3 pills & I still feel pain. I have never had cramps that hurt so much & idk if they're suppose to be this painful or if something is wrong.