Ya i agree, i would go in and get checked... it really is effortless for them to check and its worth the reasurrance even if its nothing...
Typical at home tests to see if it might be amniotic fluid include things like laying down for a bit and seeing if there is a gush when you get up. My doc said to look out for soaking a sanitary pad in an hour. The test to check if you are leaking amniotic fluid is quick (I think it might just be a pH test usually?) so I would go to the hospital and have them check it's not amniotic fluid. I would especially do so if your cramping has any sort of pattern to it.