That's your water. When I was in labor and my water broke any laughing or coughing caused it to gush out more. You can also, as gross as it sounds, smell it. If it smells like pee then it's pee if not its your water.
That's your water breaking go to hospital right away. It can leak out a little at a time diffently go to hospital right away.
I would go in to get checked :) call you Drs office if they're still open, save yourself a trip to the hospital