 [ Symptoms ] i am 27 years old experiencing hot flashes headaches abnormal menstrual periods bloated lower abdomen pelvic pain dryness when intimate with husband or low sex drive [ Disease ] how long is your normal menstrual cycle in a typical 28 day cycle the most fertile days would be from day 11 to day 15 with ovulation occurring approximately on day 14 the first day of bleeding would not be a fertile day and sperm deposited at that time would only live until day 5 so could not cause a pregnancy