Is diarrhea considered to be a sign of pregnancy or miscarriage?

Diarrhea? It is considered diarrhea only and has nothing to do with the above.
Probably not. Diarrhea is a bowel movement which is loose, or frequent or both. It may be a result of a viral or bacterial illness, certain medication or other exposures. Endometriosis may also be associated with diarrhea. If you are pregnant and have diarrhea consult your md. If you miss your menses with or without diarrhea a pregnancy test should be done, as well as an md consult.