tan color left on panty liners. what is this????

Danielle • Married my best friend on 4/11/2015. I have a son—rainbow baby born 2016, and trying to grow our little family💗💗💗
It's dry no mucous. No urine smell, no offensive or fishy smell, almost sweet? I have no idea what this could be but it's been going on for weeks and progressively  more and more as I near my due date (3days away) any ideas???