RE: Did I make a mistake?
Welcome. First, you did not make a mistake. You took a clean and safe shot. Congrats. Second, who knows what was off to your side out of sight. That's part of the fun and mystique of going hunting...the events leading up to a possible shot and the adreneline rush, etc. Keep hunting the same spot or somewhere nearby in the coming weeks and see what happens.
If today's rain let's up, I will head out this afternoon for a few hours of enjoyment and fresh air.