Third trimester diarrhea. help!!!!

For the past week I've been having!diarrhea, it's starting to make me feel uncomfortable because I'm getting at least 3-4 loose stools a day. I started taking pepto bismol since yesterday and it has not helped at all. Any other July mommies having this same problem? If so is there any remedies to end this nightmare?!!!! I know this can be a sign of beginning/ preparing for labor. Anyone started labor with these symptoms? ( I'm currently 38w 3d, first pregnancy) ADVICE/ HELP PLEASE!!!!!!!