I remember feeling that they felt crampy/tightening and then, later on
in labor that I felt pain at
my cervix. Regardless of what I did to keep myself occupied during early labor, nothing stopped or delayed them.
If you have tightening that does not change with position, hydration and rest, then you should call your doctor or go to l&d since your baby would still be considered premature and would likely need medical assistance upon delivery. How are you feeling now?