plan b or no plan b?

I was hanging out with my boyfriend and he ended up fingering me because i don’t feel comfortable having sex yet. I think I am just overthinking but is it possible to get pregnant from being fingered? I don’t think he had any sperm on his fingers but my calendar says I am ovulating and I am not taking birth control. I am just not sure if he had precum or cum on his fingers which is why I am a little nervous and want to know if i should take a plan b