Infection or not?

iva

I’ve been having a “weird” discharge the past couple of weeks. It’s yellowish/cream in color and has almost like a sour odor. I of course googled my symptoms and it said it could be an sti/std so I got tested, and it came back negative. I also got treated for a yeast infection but the symptoms are still there. My discharge usually is of similar color but without the odor so I am not sure what’s going on. Those are also the only symptoms I am having. My period are regular, I use protection always, I shower regularly and don’t use anything but water. Has anyone ever experienced something similar? What could be causing this?