Ealry labor signs?

I will be 38 wks tommorow. Since Wednesday after my cervix check. I have had period like pains in front and lower back . Some tighting of the stomach here and there. Stomach has also felt " off" also. With my first son I didn't have any early signs. Just one night I woke up with contractions. So I don't know if this is start of early labor. Please no rude comments or people please.