Has anyone had an abnormal pap smear result?

I got a letter saying I need to go back to my doctor to discuss my results. I can't get an appointment until next week and being an anxious person, this is going to drive me nuts!
Just wondering what I can expect? Will I have to have another smear or something more invasive (this is the part freaking me out!). Could it be HPV even if I've only had one sexual partner?