Hi!
The most common causes of abnormal menstrual bleeding in young women are anovulatory cycles (hormone imbalance as the body is learning what to do), and bleeding disorder. Ruling out the most common type of bleeding disorder was a good important step! I would probably want to check thyroid function as well if that hasn't been done.
I will very often start my young patients on oral contraceptives for cycle control, and it is not too unusual for them to have breakthrough bleeding in the first few packs. One thing to be certain about is whether she is taking her pill every day--any missed pills will cause breakthrough bleeding.
One trick you could ask your doctor about, is to take two or even three pills a day for a couple of days until the bleeding stops, and then gradually taper back to the recommended once daily dose. ( I will sometimes do 3 pills per day for 3 days, then 2 pills per day for 3 days then one pill per day to finish the pack--I then skip the placebo pills and go straight through the next pack)
Once you get her cycles regulated, the pills are pretty nice, as they reduce the flow, reduce the cramping and make the cycles predictable. I generally go with a good low dose monthly pack. ( I personally DON'T like the pills like Seasonale, Seasonique or Lybrel in this type of a case. ) She may be able to come off the pills when she is just a little older as her system matures.And keep her on the iron and vitamin c!
Good luck!
Dr B
hello am 21 and i have been on my period for 12 days i go threw a lot at home i still stay with my parents and i just want this to stop PLEASE HELP ME