I have been taking Biaxin for a bacterial infection in my respiratory system, however I thought it had given me a yeast infection. I was itchy and irritated and had a very thick, almost yellow discharge. I took Monistat I and had sexual intercourse the third night, and found out I was still burning and hurting. Now, I am bleeding but still have that irregular discharge so it's almost pink and has progressed to red throughout the day but I can still see the discharge. My period is not due for another ten days, but I've been cramping for the past two days. What could this be?