Stupid question, but getting no answers so far...

So hubby and I descided to stop BC. We had sex on the 1st and 3rd day of the sugar pills and then stopped the BC after the last sugar pill. That was a week ago and I have felt nauseous most of last week and it has still not gone away. I'm thinking it's just 'cause I stopped the BC, and my hormones are now going back to normal ... but, could I be pregnant? What are the chances? I have a pregnancy test, but I don't want to waste it.

I know it's a dumb question, but my doctors are not really helpful with info and google is also not helping