Has anyone had...

A neg test for preterm labor but you go into labor early still? I am 32wks as of yesterday and my test Monday came back neg but I.feel like I know my body by now. I have had three other children and they all came at 37wks. This one though I have the same symptoms and feelings now as I did right before labor with other children just earlier. I have horrible pressure, no appetite, diarrhea like my body is cleansing it's self, this feeling I need to get everything ready,and contractions that are strong but still not reg. Am I crazy?