Is this normal? First time mommy!

little tmi so I apologize in advance but I’ve literally had diarrhea for 4 weeks now. I’m 33 weeks pregnant exactly and I’ve told my doctor at every appointment & she says it’s normal but I have to wake up in the middle of the night and go to the bathroom and my stomach cramps so much from it! I’m staying hydrated and drinking tons of water, I’ve also stuck to a bland diet and also tried the brat diet. Nothing helps. Not even Imodium! Is this normal? I’m scared I have something wrong with me but my doctor won’t listen😬