You have to accept not knowing while continuing to live your life and taking care of yourself.
This is hard to do because im sure that you want to know for sure that you didn't do anything before moving on, and that the guilt/shame makes everything feel so real. But these intense feelings aren't proof that something actually happened, theyre just a tool that ocd uses to keep you stuck in a loop of trying to figure thing's out. Don't fall for it, let the feelings and uncertainty sit. You don't have to know for sure right now if you did something, not even for this situation. It isn't too serious for you to ignore and its ok for you to treat it like any other ocd thought.
I hope that this helps and here's a couple of videos if you ever need extra tips on getting through false memories and real events ocd ~