When I had leaking waters with DD it was pretty distinctive - I could feel a really warm, almost hot (sorry tmi ) trickle of fluid. It was like when you get out of a swimming pool and water comes out.

It just felt really different to normal discharge. I guess that's not much help but odds are that if you're still not sure after a few days, and it is a leak, it's a slow leak and they will usually resolve themselves. Just keep an eye on it and hang in there.