Very light spotting

So I wear panty liners because of all the discharge I get. I’m 35 weeks. Anyway, I used the bathroom earlier and noticed my discharge is becoming darker, more yellow in color and more slimy, and I noticed where my vagina is there’s a light brown color on the liner in that spot. Is this normal or cause for concern?

**sorry for gross picture. This liner was only worn about 3 hours.