diarrhea and nausea at 30weeks (maybe TMI)

Ashley
I'm a little over 30weeks pregnant and yesterday I had explosive diarrhea like I've never had before...everytime I thought I was done and I would go lay down I would have to run in and go again. It was accompanied with nausea and started out with really bad cramping. After everything stopped I sat down drank some water and gave it a bit before deciding not to go to the hospital and baby has been moving like crazy (like usual) during then and even today. My husband thinks it's due to the massive snow cone I ate prior to it (I caved to my pregnancy craving) but I also understand those are symptons labor is approaching. Anyone get this prior to labor? How far in advance? Anyone get this after eating a smowcone because I've met many people that craved snowcones during their pregnancies so I'm asking that stupid question anyways. TIA