Just a few minutes ago we went out to eat, finished our food so we left. As soon as I stepped foot outside(it was windyish) I felt nauseous and I thought I was about to throw up. I tightened my stomach so I wouldn't and it went away. This is the 2nd time it happened, the 1st I did throw up but just a little. Is there any explanation as to why it happened? I am currently 11 days late and with a BFN. Could it be a early pregnancy sign?