Am I just sick or could this be morning sicknesses?

To my knowledge I am not pregnant. I am on the pill but I know its not always effective, but it's prbly unlikely that I am. My hubby and I have been having sex a lot more than usual lately and my period is due in about a week maybe a little less. Last 2 days I have felt nauseous and sick after eating dinner I thought it may have been what I ate but it wasn't anything outside of the ordinary. Last night I ended up throwing up at 2am and I felt better, (it was mostly bile not much food) and now I don't feel nauseous this morning but my stomach is still off. Could I just be sick or food posioning, or could i be pregnant? Its prby a little too early to test accuratley. I have a history of ovarian cysts but last I knew I didn't have any so I ruled that out. Help please