Ammonia smell... no BV?

Ok so I had BV a while back and it was BAD. No itching or burning- just fishy and horrible ammonia smells. I was TTC and so I was petrified and got it treated right away.

I still have an ammonia smell now and again- but I’ve gotten tested and it’s always negative?! I’ve had the same partner - my husband- for 5 years. Never had an STD before. He is also STD checked yearly through the military so even though I’m positive he’s faithful we have medical results to back up my claim 😂

What is this !?