Strange discharge in 3rd trimester pregnancy

I'm finding a lot of dry discharge in my underwear every so often (not every day). Its white in colour and looks fairly thick. My vagina looks normal. Smells slightly different but not by much. I've researched Yeast infections and my vagina and underwear look nothing like that so I feel confident that it's not that. Its defo not my mucus plug either... I'm nearly 34 weeks gone and I'm a little confused by this.