What Are The Chances Of Pregnancy After Having Non-penetrative Sex?

My boyfriend and i were messing around, his penis did touch the outside of me
but never went inside until he put a condom on, we had sex for a few minutes
and
then we stopped..what are the chances i am pregnant? I am on birth control
(never missed a pill) but i know that precum can contain sperm .. also, he
urinated before we even started messing around i heard that kills leftover
sperm??

I am starting to worry that i am pregnant, it was almost 2 weeks ago and im
suppose to get my period in 5days.