Leaking?

I’m 26 weeks and have had an increase in discharge since about 18 weeks, which I know is normal. Yesterday morning and this morning though it was more like a gush of a clear/slightly milky fluid and happened within an hour of me waking up and being upright. This has happened to me once or twice before during pregnancy but it wasn’t nearly as much fluid as today so I chalked it up to increased discharge. But this morning was different, I’m talking enough to soak through the leggings I had on. I’m a little freaked out and going to see my doctor in a couple of hours. Anyone else had this happen? If it was amniotic fluid, what did they do? I’m positive it isn’t pee.