Woke up wet. Did my water break?

I'm 39 weeks. Yesterday, my panties stayed moist all day, and yesterday evening I had a few of the real labor contractions (not the BH ones). Today when I woke at dawn today, my panties were soaked and my pants were very damp too. It was clear and thin like tap-water. I felt a little trickle when I got up from the bed, but it slowed down and was stopped within maybe 2 hours. Any idea what's going on? Was that amniotic fluid? Why did everything stop? The baby's still kicking as usual.