It Felt Like My Water Broke, But I'm Not Pregnant.

It felt like my water broke, but I'm not pregnant. It was about a half gallon of clear fluid that gushed out of me. My husband is a marine and has been deployed for the last four months, I haven't had sex with anyone else. I had some cramping leading up to it but no other symptoms. I was just standing in my kitchen when I felt immediate strong cramps and a gush of water falling out of me all over the kitchen floor. What's wrong with me?