Hi, I am 12 days delayed on my period and I just discovered today I have yeast infection. I been searching for hours about yeast infection affecting change of menstrual cycle and some said yes it will affect and some says No. Any ladies out here experience this one? Tho I haven't take the pregnancy test yet but I don't feel anything pregnancy symptoms. Its just I have yeast infection and my period is delayed for 12 days. I hope someone can help me. Thank you