Is it amniotic fluid?

My underwear have been damp/wet all week. It's not "sweet" smelling, like people say amniotic fluid is. It isn't enough to soak past my underwear and make my leggings wet. It also doesn't smell completely like urine. The doctor said my amniotic fluid was low last appointment. Should I be worried I'm leaking fluid? Is it likely just pee, because I'm 38 weeks and baby is on my bladder? Should I call tomorrow, or just wait till my appointment Wednesday morning to ask about it? I'm no more sore than normal and haven felt any abnormal pain/Braxton hicks/contractions.