My baby has been popping really smelly lately and it's watery so I'm thinking diarreah, I know my…

My baby has been popping really smelly lately and it's watery so I'm thinking diarreah, I know my babies poop smell and I know that's not normal and it's definitely a new smell as well. If I take him to his dr she's gonna say it's normal baby's poop change all the time! But why only when his on medicine? It's really stinky and I know something is not right. 😰