IDK what is wrong with my body

Last week I got my period 5 days early. I was alarmed because of the increasing pregnancy symptoms. But once I started bleeding I figured oh OK just an early period. Well now I am still having these symptoms and they are even more bothersome. Enough that I am going to the E. R. This nausea is of the worst kind. It hurts my stomach when I sit up. My breast feel so tender that they feel like they're burning. I go to sleep nauseated and wake up nauseated. Anyone ever felt this way and got negative tests but was in fact pregnant?