Any stress, emotional or physical (even a yeast infection) can alter your cycle. The question is, what caused the yeast infection? Hormonal changes, or taking antibiotics can cause a yeast infection and also mess up your cycle. In any case, if your period is early or late while you are also experiencing a yeast infection, I doubt there is any cause for worry. I would recommend avoiding foods that contain sugars, grains and alcohol if your yeast infection persist. By avoiding these foods and applying antifungal cream for your infection will help you recover quicker. Hope that helps :)
