What is going on with my teeth?

I felt this weird thing in my mouth tonight. It looks like another tooth is trying to form behind my normal teeth. I’m 28 and I haven’t ever had problems with teeth. Anyone have any ideas? Anyone have this happen before?

http://i38.photobucket.com/albums/e104/00xj54/tooth.jpg

Please refrain from answer telling me to go see a dentist. I know that and I will as soon as possible.