Discharge question...

(Sorry for the TMI) I am 15 weeks and noticed I have a good bit of discharge. It's not enough to soak a liner but it will be damp by the time it's time to change. I had a yeast infection in my first trimester that has gotten better but I don't think has gone away completely. Im worried that i might be leakong amniotic fluid. I've read that there is a difference in smell in vaginal discharge & amniotic fluid but how do you know for sure?? Mine is light yellow (which it has been since the yeast infection) and has no smell.