Am 34, for the past 4-5 years I have been having 20 days menstrual, though when it started i visited a doctor who said its was normal since its maintained the 20 days the dates are not regular but when calculating it comes back to 20 days and then I was not sexually active. the flow normally lasted for 3 days and the flow is normal, no pains or discomfort at all. I got married 2 months ago and become sexually active, am worried because the situation remain the same and I can't calculate my ovulation at all. pls what should I do at this time.