It's normal to have loose stools or diarrhea in pregnancy, especially the first trimester. This is our fifth baby, and this pregnancy has been HORRIBLE for diarrhea! The whole first trimester it was so awful I thought I would die.
One thing I HAD to do eventually to counteract all the electrolyte loss from diarrhea, was get a whole PILE of electrolyte/sports beverages. I bought Gatorade and Recharge. At one point when the, uh, runs were really out of control, I just cranked on the bevereages and it made me feel like 1000 times better! And it also made the diarrhea better too. Same thing as women being hospitalized with an IV from excessive vomiting---but ww can keep down the electrolyte drinks and are lucky in that sense. I would highly recommend you get some and drink at least one bottle of them a day. More if you are in the bathroom like 6 times a day, which I was.
Anyway, I'm in week 14 now and getting better---yayyyy!! I hope you will feel much better soon. It's awful, I know. Oh, and Tums helped once in a while, but not always.