Own the mistake before anyone finds it. Hiding it just adds interest.

Hidden mistakes get more expensive the longer they stay hidden. Owning one early costs you a single awkward conversation and a fix; letting it surface later costs the same conversation plus the question of why you said nothing, and that second part is what damages trust. Nobody expects a clean record from you. People do notice who reports their own errors.

If something is sitting on you right now, say it today, plainly, with whatever fix you can offer. One sentence on what happened, one on what you will do. The relief is bigger than the dread.