My partner came all over me on top of my vagina without protection. What are the chances of conceiving?

Hello,

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Full penetrative intercourse has a high chance of pregnancy, but nonpenetrative contact of genital with vagina also has some risk of pregnancy because of contact of precum fluid from the penis to vagina. So you have less chance of pregnancy but wait for the next period. If the next period delayed for a week than rule out pregnancy by urine hCG (human chorionic gonadotropin) card test. If you want to exclude early than after three weeks of last menstrual period (LMP) investigate with blood hCG test. Get back with more query if you still have doubt. I hope this will help you.