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Contractions of the uterus - that are less than 10 minutes apart (6 or more contractions in an hour), that may be painless or may feel like the baby is "balling up".
Cramps like those with your period - that come and go, or that don’t go away.
Cramps in the abdomen or stomach - with or without diarrhea.
Increase or change in vaginal discharge - watery or with mucus or blood.
Low, dull backache - that comes and goes, or that doesn’t go away.
Pressure - that feels like the baby is pushing down; comes and goes.

You May or May Not Feel Pain with Preterm Labor