Yellow discharge during pregnancy

I am 32 weeks pregnant and my discharge has been slightly yellow the past few days. I always have discharge in this spot but it has usually been white throughout my pregnancy. I even had a yeast infection a few weeks ago and didn’t have yellow discharge. If I don’t have a yeast infection, BV, or an std what could be causing this? It doesn’t have any strong odor and I’m not itching/burning at all.