stomach flu or pregnant?

Sooo For starters my period was supposed to start on Tuesday... Tuesday night at about 8 a clock I started Gavin. Stomach flue like symptoms. You know not being able to leave the bathroom and sometimes needing to have a bowl in my hand as well as the toilet.. I don't want to get more graffiti than that. So anyway that lasted until early Wednesday morning like 4 am. I was kinda nauseous till early afternoon then I just felt tired. Then yesterday (Thursday) I felt relatively unsettled and had a couple sulfuric burbs and my intestines didn't feel unhappy but I didn't have diarrhea. Then this morning The diarrhea started back up. Am I sick or pregnant? Please help!!!