Remove the ring from the piston and install it into the bore. Square it up and see if the end gap is per the book. If tight you can increase the gap. If loose replace the ring. The numbers won't lie like perhaps a vendor or part number on a box.
Don't feel like an idiot- learn from the lesson, perhaps slow down a bit, and keep doing.
You'll only be an idiot if you repeat your mistakes.
Inspect the parts, take the measurements, reinstall if in spec and see what happens. The worst that can happen is you go back to where you are now.
The oil ring goes either way if you can't find a manufacturer's mark or chamfer (to the top).
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