Question about abnormal pap/colposcopy

Hi everyone! Sorry if I am posting this in the wrong spot. I'm a Peds nurse and definately wouldn't consider myself anywhere near an expert in GYN nursing. I have had two abnormal paps since June; the first said "Atypical squamous cells of undetermined significance" along with a yeast infection. They gave me a course of vaginal terconazole and brought me back in October for a repeat pap. This one too showed "ASCUS", minus the yeast infection this time. I feel fine but tomorrow I have a colposcopy scheduled and since it's getting closer I'm starting to get a little freaked out and my vivid imagination is taking me too far and I'm worrying about the worst case scenerios. Any GYN nurses out there with any knowledge they can share with me on ASCUS and my chances of a bad diagnosis? Or anyone at all with a similar experience or insight? Thanks so much for your time!