I totally vote for AF. Do you know that if you spring a little leak, and baby's head is fully engaged, it isn't GOING to gush at all. the GUSH happens when there's nothing plugging up the pathway. If baby's head is firmly engaged, there isn't much room for anything else to come through.
AF smells a bit sweet I've heard, but mine has only ever broken in the depths of labor, so I can't really remember a scent.
Teeny bits of mucous are dislodging as baby's head presses down upon the cervix, it softens up and loses its "hold" the plug isn't one solid thing like a cork. It's more like a wax seal slowly melting away. You get big pieces, you get small pieces, you get long stretchy slivers of goop.
You're on the way, girl.
Don't insert anything into your vagina right now, because you don't know when ctx will start and keep an eye on your temperature. If you're a doctor-and-hospital birthing kind of girl they will want to birth in the next 24-48 hours, so keep that in mind when you casually ask them if this is or isn't amniotic fluid. If you're a more natural type, just celebrate that this is the beginning of "it" and enjoy your labor!