Flyn
I'm from Feb thread.
Just wanna share my experience. For my 1st pregnancy, I experienced that big gust of water coming out too.. in fact, that time I was only week 35 and it happened 3 nites continuously. Duno y I was so calm, I just observed and thot if happen for the 4th nite, then I'll call gynea. That time I was still early for delivery, so didn't think it was water bag burst.
On my next checkup, gynea checked, no leakage. But he didn't check my amniotic fluid. So I let it be... Only on week 37, he checked my amniotic fluid and discovered that it was quite low. I was put on bed rest and drink a lot of water. Then on the eve of my next checkup (week 38), the big gust of water happened again, this time a lot more.. next day gynea checked, my amniotic fluid dropped a lot till quite dangerous low level. I was thus asked to induce 2 days later.
Hope this helps. Ask yr gynea to check for leakage and amniotic fluid if it happens again.