Discharge & burning but everything negative

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So recently i noticed i been having white thick, sometimes yellow and stretchy discharge. And burning on and off. Some days ill feel fine and others i will feel it burning snd uncomfortable.

I went to gyno and yeast/bv and stds came back negative... what could it be ?? She said it can also be from my birth control but i been on these pills for 3 years no problems. Anyone else had the same problems with no answers?

Any recommendations?