I agree and would talk to your dr. But like tinkerbell said it sounds like a UTI.
It could be an irritation of some sort; if it’s external of the vagina then an anti-itch cream might be prescribed. I don’t want to be TMI but, that’s what I was given. But I agree talk to your OB first.
You can try an OTC wipe, but since you're 27 weeks, I'd suggest you seed your doc because it could be a different infection, and apparently these infections can lead to preterm labor.