I had really bad stomach cramps (contractions maybe?) with diarrhea is this a sign I will be going into labor in a few days? 37 weeks pregnant

Maybe. Sometimes when women are in early labor they will experience uncomfortable menstrual-like cramps with a little diarrhea. Diarrhea from other causes, like something you ate, can also cause cramping that can feel the same. Monitor for contractions that happen every 5 to 10 minutes and are starting to take your breath away or your water breaking. Call your doctor if you are not sure.
Time them. If you are having cramps or contractions every 5 minutes, you need to be evaluated at your labor and delivery suite. Call your doctor in the morning if not, to let them know.