Am I pregnant?

I have been on the pill for about 10 months and I recently went to visit my boyfriend for spring break where we had unprotected sex multiple times the entire week. A week later when I was leaving on the airplane, I had a sandwich and felt nauseous the entire plane ride. When the plane landed, I threw up everywhere. And i felt nauseous the rest of the day. I'm supposed to start my period in two days, yet I'm getting none of my pms symptoms. No bloating, no cramps, no diarrhea. Nothing. And I'm worried. I'm tired and just nauseous and dizzy. Help?