His hands :(

So I know it sounds dumb but my partner and I were doing it and he finished but not in me. He had a condom on and took it out when he was close to finishing but finished in my back. He cleaned it off my back with a tissue and we continued other stuff. We were playing around with my toy when he started to finger me just a bit. I got paranoid because it was the hand he used to clean but at that point his hands didn’t rlly touch the cum just the tissue, also liek 10-15 minutes have passed sense he cleaned it and I’m supposed to start my fertility window in 3 days. Sould I be scared and take plan b or am I ok.