PCOD, PCOS, excessive stress, and poor mental health can be causes of irregular periods. If left untreated, these conditions can affect ovulation and fertility. A regular menstrual cycle typically occurs every 28 to 35 days and lasts about 3 to 8 days. If your menstrual cycles occur earlier or gets delayed by several days, that can be a serious concern. Here are some home remedies that help regulate periods.