Can spotting be caused by whey protein and sugar alcohols?

I am a pre-op and post menepausal. I ordered samples and also tried other protein drinks and nectars. Each time I drink one I spot. I even tried soy protein which gave me a full fledged period. I understand the soy mimics estrogen so I quit drinking those. I suspected it was the sugar alcohols so I tried some whey without it and still spotted. Thinking about egg protein now without flavor or sweetners. I need suggestions as to what maybe causing this. FYI, pcp and ob/gyn don't have a clue either.

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