Good thinking.
At 33 weeks something similar happened to me and I was in preterm labor. It sealed itself back up but it was scary
At first I thought I had wet myself, but it didnt smell like urine, so my next guess was sweat but with the cramping too I want to check it out rather than pass it off as nothing :)
It could be sweat. That happened to me. We get sweaty down there easier xD
But if it was your waters, it probably sealed itself back up since you havent had anymore wetness