Is my mind playing games with me?

I had a chemical pregnancy and lost it on 9/11 by the 17th my hcg levels were at 0. I only bled for less than a week. I suspect it stopped developing awhile ago and just passed when the bleeding started on 9/11.

For the past week, if been nauseous every morning. Sometimes throughout the day. I’m aware it’s too early for symptoms but with this last pregnancy that I lost I also felt nauseous very early on. I took a pregnancy test today and it’s negative. I haven’t had a cycle and don’t even know when I am supposed to ovulate. Is there a chance I am pregnant? Or am I going crazy?