Nauseous ness

Stephany
How long after unprotected sex "if I am pregnant" could I start to feel nauseous? Assuming we nailed it last time we had sex when I was ovulating, could I feel nauseous? It would have been about a week or so ago. I was grocery shopping and all of a sudden I felt nauseous, like I wanted to yack. I have eaten today and had water. Suggestions? Advise? Thanks all!