My periods have been heavy but this months period was extremely light and the past two weeks ive had diarrhea, nausea, headaches, dizziness, seem to be eating more, gassy and a dry throat. Any suggestion on what it could be? Yes i do have unprotected sex but he had never came in me. I took a pregnacy test but it didnt take long for it to show the results but it was suspose to take three minutes but it took less than a minute and came out negative so i think i did it wrong.