Could be labor. Soft stools can be one of the signs or you could just have an upset stomach. Monitor your contractions and you'll Figure it out.
I've been going through the aches, pains, and diarrhea too. Been going through it for a couple days now. But I've also been having extreme lower back pains and major pains in my pelvis. It's been keeping me up all night! I didn't go through this with my other 2 kids. Maybe it's our bodies way of getting ready for baby.