First of all if you haven't used contraceptive this time and period has been delayed, and now have prolonged flow, do a urine
pregnancy test. If it is negative, if your period doesn't stop in 10 days, you may require hormonal preparation to stop bleeding as it cud be likely due to absence of ovulation. An additional transvaginal pelvic scan could be more informative in that situation. This
aids in appropriate treatment. If you stop bleeding, start on daily folic acid supplements to aid conception and do physical activity.