Likelihood of Pregnancy From Cum on Fingers?

I feel really ridiculous even asking this, because I know I probably don't have anything to worry about. But, just for peace of mind, I figured I would ask. After having sex, my boyfriend removed his condom and soon after we began making out again, potentially gearing up for round two. He began rubbing his penis, and then inserted his finger into my vagina. What is the likelihood of me becoming pregnant because of this? I know I shouldn't be, but I'm really freaked out. Please help!