Is diarrhea before menstruation a sign of pregnancy?

Diarrhea before menstruation is not a symptom of pregnancy. There are many reasons for diarrhea, such as eating cold food, catching cold in the abdomen, eating spicy food, bacteria or virus infection, etc. As long as there is menstrual cramps, it means that there is no pregnancy. You can go to the hospital to perfect the examination and clarify the cause of diarrhea.