Tested negative for BV. What could it be?

Maliii

I started having liquid discharge kinda light green, but not itchy, redness, swelling or pain just lower back pain. Went to the Dr 100% sure it was BV bc I've had it in the past with the same 2 symptoms BUT I WAS NEGATIVE 😩 What else could it be? I tried calling to speak to a medical assistant bc I was prescribed metronidazole to treat BV bc my Dr and I believe that's what it was so Idk what to do about the meds since I took 2, but stopped after getting the results and bc it made me super nauseated in the morning. I have acid reflux which keeps me nauseated almost always. ANY IDEA WHAT ELSE IT COULD BE???