Severe dehydration can provoke a miscarriage given a certain level of severity of diarrhea and vomiting, or more precisely how many times a women goes into the toilet. If diarrhea is severe and accompanied by vomiting it can become worse because liquids and salts can’t be supplied naturally. In such cases you may need to be treated with intra venous infusions. Microbiological examination of the stool can be performed to identify the possible infective agent. You can contact your GP and then an infectologist to follow up, if necessary.