Fingers crossed! If your first three songs went well, hopefully the examiner won't come down too hard on nerves (was it nerves?) in the unaccompanied one and look for musicianship. When I did my grade 8 piano, I remember going to pieces and messing up my aural tests, and coming out of the exam room in tears - but I still managed to pass them.
I completely understand the personal satisfaction aspect. We musicians communicate through our art and we all need to know we're doing that well! By the way, was the exam ABRSM? Or Trinity?
Anyway, I hope you don't have to wait too long for the results. Keep enjoying your singing - and I think it's wonderful that you've got this chance to develop your voice!
Good luck!