So its more than likely food poisoning. not pregnancy?
Go to the doctor I don't know what the symptoms are, but when I hear this started after a chicken sandwich I think about salmonella.
In general, salmonella symptoms begin with nausea and vomiting and progress to abdominal pains and diarrhea. Additional signs and symptoms include fever, chills and muscle pains, and can last anywhere from several days to two weeks.
Go to a doctor