Water Break or something else?

Okay so I've had 3 full term previous pregnancies. My water has never broke naturally. Today I had a small gush of fluid where it soaked my panty liner. I went to change it and it felt like I kept dripping. I put on a new panty liner and went to take an nap. I've been really crampy since this happened and I continue to have a trickling feeling and my panty liner is wet again. This has been over a 4 hour span. Thoughts?