What exactly does it feel like? I've heard of people who only had back labor and I guess I would like to know the difference from contractions or regular labor if that makes sense.  My sister told me oh if your back starts hurting your in labor but is it like a constant pain? Or is it just pain off and on? Guess I'm just confused. Ftm, gonna be 39 weeks Monday just trying to know what I should keep my eyes out for.