Is it possible?

I was on Nuva ring, but my prescription ran out before my new insurance went into effect. Two weeks after my last Nuva ring period, I started seeing pinkish/brownish discharge which usually happens a day or two before my period starts. That day, August 21, my husband and I had unprotected sex. If you count that as day one of my period, it lasted a little over two weeks but was pretty light. Of course this could just be from going off of Nuva ring, but it didn't happen last time I went off birth control. Now I'm wondering if there might be any chance or if I'm just being silly. I attempted to take a test this morning, but I must have messed it up because not even the control line showed up. I have another that I will probably attempt tomorrow morning, but the suspense is absolutely killing me. I have been feeling slightly nauseous, but it could just be from the nerves. So is there any possible chance it might be a positive?