I have been having diarrhea off & on for 4 days, 3 days late on my period (even thou I been taking my birth control pills every day only had sex twice during the month) light nausea & little vomiting, took two at home pregnancy test both came back not pregnant, nose is running off & on, draining of mucus down my throat is all day long, have allergies & asthma. I m very scared any idea of what could be going on.