Thanks for your query.
Firstly, you have to consult a proper doctor as this amount and duration of menstrual bleeding is not normal.
It would leave you anemic, not to mention various other problems like endometrial hyperplasia
is given to stop the bleeding.
However, you are not supposed to be planning a family while on norethisterone, as it can have adverse effects on the baby.
YOu can request your doctor for an alternative treatment with other safer progesterone
preparations to control your menorrhagia
However, I feel a complete investigation, ultrasound and a hysteroscopy
or D and C is in order as what you describe is definitely not normal or manageable for long with medications.