I have a change in smell of my vaginal discharge and it's not yeast infection.whats the problem?

Requires an evaluation. The odor from a discharge represents gasses produced by germs feeding on the protein & sugars in the normal vaginal mucus. Identification by odor can be suspected by a trained provider, but an exam of the discharge is often required to yield the best diagnosis and treatment. Just saying it smells doesn't give enough data to work with.