Pre term concern?

I'm 31 weeks and a few days, for almost a whole day I've been experiencing loose stool to the point of diarrhea. I heard it is one of the common signs of pre term labor. This is breaking my heart and making me worried a little bit. I will be going to an appointment today and will be bringing this up to my doctor, but I would like to know of any of you ladies experienced this symptom & went into actual labor? Much advice needed.. I just want my baby to be healthy.