When I Confessed That My Boss Gave Me an Extra Day Off Last Month

Hi, so here's the thing, I have this new job where my boss recently gave us some extra days off as a perk for good work. But one day, there was confusion at the office and it looked like we were missing our regular tasks... turns out I got that extra day off last month but didn't tell anyone. So, now everyone thinks I'm slacking when really I just forgot to mention it. Should I come clean? What would you do in this situation?