Cramping or contractions?

Jessica • a Gypsy soul with cowboy to reel me in and a cowboy to be, born January 24th, 2018.

I’m 27 weeks and a new Mommy-to-be and I have so many people say this or that but a couple of people said that severe “mensural cramping” is me dilating and contractions. One person said call the doctor ASAP and the other said to not worry because it takes a long time. AM I dilating? Should I call my doctor?