My mother scheduled me for a pap when I was 16, at the time I had no idea what it was and the doctors (after learning I wasn't sexually active) explained that they usually start smears at 21, only younger if sexually active. I have heard stories of girls that caught abnormal cell growths at a younger age than that.. And neither of them were sexually active! It's definitely a good thing to stay on top of.
OP, good on you for being so proactive about this. Hope the apt goes well :)
We are not human beings having a spiritual experience. We are spiritual beings having a human experience. -Pierre Teilhard de Chardin