Hey Winter!
How exciting!
My waters started with what I called a "trickle" - I'd say a tablespoon or so while I was lying down... but when I stood up there was more, like 1/4 cup, 1 pad?? In the car on the way to hospital I soaked through another pad, and then when I stood up getting out of the car I had a bigger gush - like a cup, maybe? My trackies were soaked through. Maybe your waters have broken 'higher up" and your bub's head is blocking the flow??
Have a great birth!!