Leaking?

My doctor told me not to worry about the menstrual like pains I've been having unless the baby isn't moving, I'm bleeding or if I'm leaking or start to have contractions but my question is how do you know if you're leaking or just having normal discharge? I feel like I'm always really ummmm wet I guess down there but I don't know how to tell if it's leakage or just normal any ideas?