This would most likely occur in the second and third trimesters and might be associated with elevated blood pressure, swelling and protein in the urine. Giardia lamblia is also a frequent cause of diarrhea. New antigen detection assays have improved the ability to diagnose Giardia in the stool. If diarrhea continues, sigmoidoscopy can be done even during pregnancy. Conditions that can be diagnosed with this technique include reactivated or newly diagnosed inflammatory bowel disease, bleeding from internal hemorrhoids and other lesions in the colon.
Continued diarrhea is an indication for stool culture at the very least.
This is, of course, a concern because diarrhea causes weakness, dehydration and incomplete absorption of nutrients. If your obstetric care provider is not a help with this, perhaps an internist could provide a second opinion. I wish you well and hope this resolves. You should not rely on this information as a substitute for personal medical attention, diagnosis or hands-on treatment. If you are concerned about your health or that of a child's, please consult your family's health care provider immediately and do not wait for a response from our professionals.