False water break??

Kelsey
I'll be 38 Weeks tomorrow, and last night I had a gush of fluid after I bent over to pick something up. It soaked through my gym shorts, and kept leaking for around 30 minutes. We went into the hospital, and the nurse said it definitely appeared to be my water that had broken. They ran a test to be sure, and it came back negative for amniotic fluid, and I was sent home. 
Today, I have been leaking non stop. It's gone through my underwear and jeans multiple times. I called the doctor again, and they said it was likely just watery discharge. Anyone else have any experience with this?? It seems like a LOT of fluid. 
Thanks!