I Need A Man’s Input On This As I Don’t Know How To Cut The Cake

I’ve been seeing this girl for a few months now, and it feels like things might be coming to an end. A few days ago, we were lying with each other , and as I inspected my groin area I noticed some precum in my private area. I don't quite remember if I washed my hand or wiped it on the bedsheets, but I ended up fingering her with that same hand. Now l'm a bit concerned about the possibility of pregnancy. l've read that the chances are really low (less than 1%), but I still feel uneasy. I want to talk to her about maybe getting a Plan B, but I'm worried I might be overthinking it and making things more complicated. That’s all that occurred.