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Sure, it happens all the time with false memory OCD. The thing to do, in my opinion, is to accept the uncertainty that maybe it did and maybe it didn't happen, but it's not happening now. Then, go do something fun/constructive to distract yourself. What you don't want to do is ruminate about it all day. It only feeds OCD, and is exactly what the disorder is trying to make you do.

You have to understand what you are dealing with. Think of a treadmill that won't stop, unless you jump off it. Same deal with OCD. If you're trying to figure out if this thought of yours is real or not you'll only stay on that treadmill, and it will get faster and faster and faster. Please keep in mind that you can't reason with OCD, it's not built that way. What you're doing now is searching for absolute certainty that this event happened or didn't happen. That's how OCD keeps you on that treadmill. You need to learn to stay in uncertainty and stay in the present, two basic tenets of ERP therapy. If you don't learn it, there's a good chance that OCD will keep manifesting itself into different themes, and you're right back on that treadmill. Trust me, it's no way to live. That's why I encourage you to seek therapy with a trained OCD therapist who uses ERP therapy. What you're dealing with is malware in your brain. An OCD therapist can help you unravel it. Hope this helps.