Hello,
Medroxyprogesterone is usually given for only a few days in a row each month. You may need to start taking the medication on a certain day of your menstrual cycle and it is not safe to take this medicine in larger or smaller amounts or for longer than recommended.
Since the bleeding has not stopped get it checked by your doctor and also get menorrhagia ruled out. Excessive amount or duration of menstrual flow, at more or less regular intervals is called menorrhagia. Sometimes it is associated with polymenorrhea(Frequent flow, cycles of ≤21 days)Causes of menorrhagia are Hypothyroidism, Endometrial proliferation or hyperplasia like ovarian tumor and polycystic ovarian disease, endometrial polyps and neoplasia, endometriosis, fibroids and uterine sarcomas.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
It could have affected since you did not take as prescribed. I would visit or call your doctor or pharmacist to find out if this is a possible and/or likely cause.