Diarrhea in early pregnancy

I am on promethium and thought I’d be constipated because of it but I’ve been having a lot of diarrhea (sorry for the tmi) and today was especially bad. Been drinking as much as I can tolerate and trying to take it easy. I also have an appointment with my doctor tomorrow which works out well but just wondering if anyone else has had this problem? I am almost 5 weeks along. Thanks!