Accidentally Connected to an Unknown Device

Paranoid question. While initially setting up Syncthing on my laptop and trying to add another device, a request for approval to connect to my system popped up and I accidentally accepted it. However, it wasn’t a device I was actually familiar with. After quickly realizing my mistake, I then immediately removed the device. Should I be concerned that the unknown device could access my system?

Thanks for your help.

If you did not share a folder with that device, it could not have gotten any data.