If you have to ask whether you should have made a move, then you shouldn't have made a move. If someone is interested they'll make it clear. Make sure to provide openings by flirting, and then go with your gut. When your gut is asking questions or doesn't have a clear answer, that's your brain trying to overrule or out-think your gut.

And even more convincing - the next day you still don't know. I've had situations where I didn't make a move, or sensed things were going well but didn't move on it, but I've always been able to see the clues afterwards (and slapped myself for being a fool). If you're still wondering whether you should have done something, then you did the right thing by leaving it alone.