Hello, So This Is Kind Of Awkward For Me But

Hello,

So this is kind of awkward for me but I'm kind of worried about it so whatever.me and my girlfriend were hooking up and what not and she was giving me a hand job while I was fingering her. This happened last night. After I came, I may have wiped off some of the sperm with my fingers and then continued to ginger her. I'm wondering if it's possible that she may become pregnant this way? Is there anything I can do to prevent it if it s possible? I've heard of plan b but first I need to know if I should really be worrying about this or not. Thank you