Possible Pregnancy?

Rachel
Help! 2 days ago i threw up 4 times and then yesterday i felt fine, a little dizzy and then last night i felt nauseuos and now this morning i cant stop burping and I'm badly nauseous. I took a 2 tests a couple days ago and they said negative but i havent gotten my period and its at least 5+ days late and its never been this late before. Could i be pregnant?