On a scale 1-100, what are the chances of my gf being pregnant?

Were both 19, we had sex but it wasnt a full blown intercourse. I put my penis her for like 30 seconds or a minute and didnt ***. And I kept pulling out to wipe off any precum that came out and I d push and extra precum out and wipe it off too. Shes not on birth control and we didnt use a condom.
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