Girls, urgently!!! Tell me about contractions, in what area they start…

Girls, urgently!!! Tell me about contractions, in what area they start, and what kind of pain? Yesterday for a whole day it hurt in the stomach area, today, right now, sharp, very painful cramping pains in the stomach area and up to the pubic bone, I'm writing off on the stomach, as I have been suffering from heartburn since before pregnancy, gastritis, but still, I would like to know from you?! There is no pain in the lower abdomen or pulling, when I turn over on my side the pain goes away