This is what I found for you.
Just when you think you can't possibly get any bigger and you'll never get off the couch without a crane, you may experience the following symptoms that let you know the time is near. Note that these symptoms don't occur in any particular order, and several may occur within the same day or a few days of each other.
An increase in vaginal discharge, possibly brownish or pinkish in color
"engagement," or the sensation of the baby dropping lower into your pelvic cavity
braxton hicks contractions or "practice" contractions that feel like a tightening or hardening of the uterus with possible mild cramps
slight weight loss
dull pain low in your back that comes and goes
loose and frequent bowel movements with cramping
sensation of building pressure or cramping in your pelvic/rectal area
a feeling of restlessness/increased energy, or marked sense of fatigue
softening, thinning, or dilation of cervix (as shown by doctor's internal exam)
kristin