Anak, please go to your doctor or OB agad-agad if you're having diarrhea in your third trimester, hindi kami dapat mag-guess sa ganitong bagay, lalo na ngayon na malapit mo nang i-deliver! Better safe than sorry talaga, kaya I'm really urging you to get checked out right away so they can make sure everything is okay with you and baby. Thinking of you, mama!