The pill should be effective since it does not pass as such through the bowel and is digested in the stomach; even with diarrhea
it is still possible to retain the food for sometime in the stomach. Pill-effect can be lessened only when there is vomiting
soon after pill intake. Please take proper treatment for diarrhea. The pill can protect when taken within 72 hours of an unprotected intercourse
and it is a one-time protection. It cannot cover multiple occasions. Please go for a regular form of contraception
. Hope this helps.