Not pregnant, but "water broke" ??

Two nights ago I woke up about 4:30 in the morning and I felt like I was gushing from my vagina. My. Is due in 2 days. I thought I started my. Early and that it was just blood coming out, but it was coming out way too fast and too much volume. It basically felt like my water broke, but I'm not pregnant. I lost about a half of cup or a little more, of fluid. I couldn't stop it. I knew it wasn't pee. It was clear and odorless. But, there was some white mucus in it too. No blood. Has this happened to anyone else? I really did feel like my water broke but I'm not pregnant. I don't know what it is and if I should be concerned. Please share your story if this is ever happened to you or if you have heard of this happening. Thx! And, baby dust to all!