ETA - I had only had one partner when I had my first smear too
I think this is a great point to make.

Without getting too personal, I have only ever had 2 sexual partners. One was my dirty cheating ex and my now DH.

Cervical cancer is predominately due to a HPV strain and despite your sexual history, your partners or exes could have been with someone who exposed them to HPV.

Bottom line is if you've ever been sexually active, you have just as much chance as being exposed having one or two partners than someone who has had a lot more