S.K.
it could be a few things I think (as Im no dr but I like to try to be) One your body could be starting to "clear" things out before labor begins. Sometimes people will get really nauseous or get diarrhea as a pre-labor symptom. Or that the baby is so low that every time you are contracting your sphincter muscles are also contracting pushing the bm out. Good luck to you momma!