TMI Question

I've been taught that an early labour sign is loose stools because your body is getting rid of all the toxins and everything before giving birth. We're actually learning this in our birthing class now. This is my first pregnancy, and I've always had this gut feeling I would go into labour early.... but... my question to you guys - Is it too early to be having loose stools at 33 weeks? Has anyone else experienced this and gone into labour a couple weeks later? I'll check with my midwife next week at my appointment but wanted to see what everyone's thoughts were!